[Q] Unlocking phone without using another carrier's SIM Card - myTouch 4G Q&A, Help & Troubleshooting

Hi guys
I purchased a t-mobile mytouch 4g outright last week (no contract). When I contacted t-mobile about getting the phone unlocked, they were happy to provide me with an unlock code. The only problem for me is that unlocking the phone requires using a SIM card from other phone provider, something which I dont have access to atm. Is there any way for me to unlock the phone without having to use a SIM card from another provider. Buying a SIM card isnt cheap (eg $25 for AT&T SIM card), and I would like to get the phone unlocked before I head overseas (in case the unlock code doesn't actually work, I won't be able to return the phone to t-mobile without having some difficulties.

The only way you would be able to do that, that I know of would be to root it and do the s off procedure. I think that also will do the sim unlock for you too. Read over the method that uses gfree and visionary. I think it talks a little about the sim unlock and when in the process it occurs.
Maybe you could just go to att and ask them if they have a sim card you can pop in to complete the process.

borrow one if possible, or do the root method. Worked perfectly fine for me doing that method

First of all to correct True if you go that path you van manually do it via Radio S=OFF, since you have the code why go though all of that? Just do as Osu said and barrow any GSM based carriers SIM. This is another example of Android fail as WinMo has simlock.exe as toolkit for this very reason to unlock it without SIM card.
Sent from my HTC Glacier

Is this a new process for unlocks from T-Mobile, that you need to have another provider's SIM card? If I recall correctly (dubious) from getting an unlock code for an MDA and an SDAseveral years ago they would just email you the unlock code and you would enter it into the phone.
Related question if I may: Does T-Mobile still give unlock codes to people who purchased a subsidized smartphone (in particular the MyTouch 4G)? I am considering buying three to replace aging original iPhones and a major reason for me sticking with T-Mobile over the years is their unlock policy. Just want to make sure it's not significantly different for smartphones.
Thanks ... Mike

wenglish said:
Is this a new process for unlocks from T-Mobile, that you need to have another provider's SIM card? If I recall correctly (dubious) from getting an unlock code for an MDA and an SDAseveral years ago they would just email you the unlock code and you would enter it into the phone.
Related question if I may: Does T-Mobile still give unlock codes to people who purchased a subsidized smartphone (in particular the MyTouch 4G)? I am considering buying three to replace aging original iPhones and a major reason for me sticking with T-Mobile over the years is their unlock policy. Just want to make sure it's not significantly different for smartphones.
Thanks ... Mike
Click to expand...
Click to collapse
What is their unlock policy?

tmobile's unlock policy is 1 unlock code every 90 days.

If the phone is taken on a contract, I believe the unlock policy is that it can only be done after 90 days. I bought the phone without a contract outright, which is why I was able to get the unlock code within a week (although I had to call them up and argue a little).
With regards to the unlocking itself, from what I understand if the phone is not rooted (I don't wanna do it yet as I'd rather keep the warranty for the time being, at least while Im still in the US), then the only way it can be unlocked is with another carrier's SIM card because that is the only way that you get prompted to enter the code. I have a code available for my phone, it's just getting the damn card so I can actually unlock it.
btw Im currently in a country with no contacts who are with AT&T, so getting their SIM card is easier said than done. It costs 25 bucks to purchase a AT&T SIM, something I would rather not do to get the unlocking procedure done. From what I've experienced At&T is the only major provider aside from t-mobile which still uses SIM cards, and Boost mobile/Sprint cards won't work with regards to unlocking because they use a completely different type of network, so the phone can't even detect their SIM card (I tried a Boost SIM and it didn't work)

wenglish said:
Is this a new process for unlocks from T-Mobile, that you need to have another provider's SIM card? If I recall correctly (dubious) from getting an unlock code for an MDA and an SDAseveral years ago they would just email you the unlock code and you would enter it into the phone.
Click to expand...
Click to collapse
I just recently unlocked some of my older T-Mo phones to sell them more easily. They will provide you unlocks for a retail price phone in one week, or a contract subsidized phone in 90 days. You can even request unlocks for phones you no longer use (like my T-Mo Dash I found in a box in the garage).
To "complete" the unlock process you must insert a non-TMo SIM card and the device will prompt you for the code. After entering the code, the phone is unlocked and will remain that way. Borrow a friend's SIM, it's what I ended up doing. Alternatively, if you are just wanting to unlock to resell the phone later, the code is "always valid" for that phone's IMEI and you can just provide the next owner with the code.

Off-topic posts removed...please don't post if you have nothing helpful to say.

holdup said:
With regards to the unlocking itself, from what I understand if the phone is not rooted (I don't wanna do it yet as I'd rather keep the warranty for the time being, at least while Im still in the US), then the only way it can be unlocked is with another carrier's SIM card because that is the only way that you get prompted to enter the code. I have a code available for my phone, it's just getting the damn card so I can actually unlock it.
Click to expand...
Click to collapse
You can unlock without rooting using gfree, if getting a SIM is truly an issue just to complete the process. See the gfree thread.
gfree usage:
gfree [-h|-?|--help] [-v|--version] [-s|--secu_flag on|off]
-h | -? | --help: display this message
-v | --version: display program version
-s | --secu_flag on|off: turn secu_flag on or off
-c | --cid <CID>: set the CID to the 8-char long CID
-S | --sim_unlock: remove the SIMLOCK
Click to expand...
Click to collapse
Just run gfree only with -S and that should do the trick and leave the phone still S-ON and unrooted.

What happens if you boot your phone without SIM card? Maybe you can unlock then?
I'm unlocked so can't check that myself
Sent from my HTC Glacier using XDA App

mr.tenuki said:
What happens if you boot your phone without SIM card? Maybe you can unlock then?
I'm unlocked so can't check that myself
Sent from my HTC Glacier using XDA App
Click to expand...
Click to collapse
Last time I did this it functioned normally aside from no cell service. WiFi and everything else worked fine. No unlock prompts.

Holdup & Genocaust you are right. I found the unlock email from T-Mobile when I last did this in 2007, and yes, you do need to insert a foreign SIM.
holdup, not sure what you mean about only being able to use an AT&T SIM. I know for a fact you can use any UK-based SIM (T-Mobile, O2, Orange, Vodafone, even Tesco). You might look on fleaBay or Craigslist to see if anyone near wherever you are at has one for sale. It doesn't need to have credit on it as far as I recall.

I know that any international gsm Sim will work, but part of the problem is I won't have one until I leave the country, and if the code by some chance doesn't work getting it exchanged or refunded. The At&t sim im referring to is a US sim, not Uk (might have been some confusion there), which t mobile assured me would work. I don't want to buy a sim online right now because I don't have a fixed address for more than a few days at a time (currently doing a tour of the Us).
Sent from my HTC Glacier using XDA App

You could just go to the AT&T store, and do one of the following:
1. Flat out ask them if they could let you borrow an AT&T SIM so you can unlock the phone. BTW, the SIM they lend you does not have to be activated for this to work. It just needs to have a different network ID in it, which it will, because it will either be blank or it will be AT&T's; and in either case it wont match the TMobile network id.
2. Tell the AT&T store rep that you are wanting to bring-in your mytouch into their network (you'll buy service), but that you first want to see how it would behave in their network... And so, could they let you borrow a SIM to "test drive" it in their network... tell them you heard the phone has a radio that is compatible with their 3G frequency and that you want to verify that...
BTW, there is another way to access the unlock screen. It's just that the easiest way to trigger that software is to insert a SIM with a different network ID. Call tmobile or HTC and they may give you the other process. I have done this in the past for other handsets...

holdup said:
I know that any international gsm Sim will work, but part of the problem is I won't have one until I leave the country, and if the code by some chance doesn't work getting it exchanged or refunded. The At&t sim im referring to is a US sim, not Uk (might have been some confusion there), which t mobile assured me would work. I don't want to buy a sim online right now because I don't have a fixed address for more than a few days at a time (currently doing a tour of the Us).
Sent from my HTC Glacier using XDA App
Click to expand...
Click to collapse
It only takes 5 minutes. You don't have any friends or coworkers with a GSM SIM you could borrow? That's how I used to do it for my old dumb phones.

i know it takes 5 mins, but if you bothered to read my post you would read that Im in a foreign country with no contacts, currently working in a hospital. Virtually all doctors I work with have an Iphone or some CDMA phone, haven't come across anyone with AT&T.
Anyway, got the phone unlocked, just went to an AT&T store n pretended to be interested in buying a SIM, then used a sim card they provided to unlock, thanks to everyone for their help

Related

I have t-mobile's code... now what?

I've not seen a post on how to unlock the XDA if you do have the unlock code from t-mobile. I sent them an e-mail, they responded, quite quickly I might add. Gave me the number for my phone.
But without a non-t-mobile SIM card to insert (which would force it to prompt me to unlock... as I understand it) how do I get my PPC to accept the unlock code?
thanks
Eric
Just use the XDA developer xda-unlock tool :wink:
When you insert another SIM card, it'll ask for that code. That's what I am guessing.
you need to get a sim from another company. they do not sell them at the stores. i was fortunate to have a friend who lent me his to unlock mine. check with friends to see if they have a different carriers sim otherwise i would check ebay.
You are correct. When you insert another carrier's SIM, you will be prompted to enter the unlock code. Best bet is to borrow a SIM from a friend who is an ATTWS GSM subscriber. My understanding is that you only get prompted for the code the first time (but I'm also unsure whether this will survive across a cold reset).
This is indeed what happens. I am a T-Mo customer and requested my SIM unlock code. They never actually sent it to me, I had to call back and the body of the email was there in the support log... anyhoo... when I took it to Canada I purchased a Rogers AT&T SIM card and sure enough when we put it in, it asked for the code. Simple as that!
NOTE: Rogers AT&T service is absolutely TERRIBLE in Halifax, NS and its surrounding area.

Sim Unlock My Wing

I just inherited my brother's phone, a wing he used in the states and i owuld like to use it in the UK. can anyone please help? im dying to try this manificent phone
google IMEI CHECK
i know about imei check but i was hoping there would be a free solution out there
unfortunately not at this time for the Wing.
Is the Sim Unlock Available for Wing
Is the Sim Unlock available for Wing Now or still not. Any help will be really appreciated.
No. it's been 2 days! haha
THIS IS THE ONLY WAY TO SIM UNLOCK THE PHONE FOR FREE.
Have a T-Mobile user put their SIM card into the phone and call 611 from the phone. Go to Customer Service and inform them that you will be leaving the country and would like to unlock the phone so you can use international prepaid SIM cards to call your aunts and uncles in *insert non-US country here*. They will give you the unlock code for the phone.
This will only work if the T-Mobile user has had the T-Mobile service for more than 30 days. If you are able, have your brother do it from his SIM card since he had the phone previously.
Thanks for the advice. Works!
Ok, just for conversation. Lets say I want to get a new wing with my equipment protection from Tmo. Does a SIM unlock on my old wing make it useable for others?
Equipment protection? Huh? Are you talking about getting it replaced with the insurance? and giving your old one to someone else?
When the phone is locked, it ONLY works under T-mobile.
When the phone is unlocked, it will work with any carrier, ie TMO, ATT, etc..
How about Vodafone NL..
Is there any free solution to sim unlock it ..?
Anyone with a Herald/Atlas or any of its variants ... are all in the same boat. There's no free unlock solution as of yet.
AT&T and T-mobile both have the same policy on unlocks:
- Account must have existed for at least 3 months
- Must not have had an unlock request within the last 3 months
- (Generally) Must be outside the Buyer's Remorse period (30 days)
- Must not be one of the 'special' phones (Sidekick, iPhone)
If the Wing is an upgrade to your existing service, you can get it unlocked after 30 days.
New customers must wait 90 days.
Simple workaround: If you know someone on T-Mobile with an available unlock (one per 90 days, remember), you can just give them the IMEI number, make & model, and they can unlock it from there. They do not check if you're calling from that phone -- but the phone must still belong to the carrier/be branded with that carrier
SO if my phone is "lost" and i get a new phone. Is myold wing good to go for someone else?
duprade said:
No. it's been 2 days! haha
Click to expand...
Click to collapse
Is someone working on unlock for Herald???

Urgent AT&T network problem: Atrix 4G Android

I am urgently in need of someone who can solve this network problem I have been having. Right now I can not access any mobile network with this phone.
I am using an Atrix 4g unlocked and rooted.
Basically, my problem is that my phone has been asking me for a "SIM network unlock PIN" every since my time in Italy.
I recently went to Italy 2 weeks ago, and came back yesterday. On my first day in Italy I bought an Italian SIM card from the Mobile Network company Tre, a company similar to AT&T. When I replaced my AT&T network card with the Tre one, it asked for the SIM network unlock pin. Seeing that I did not have a code on me at the time, and after trying several numbers given to my by Tre, I replaced the tre card with my original AT&T SIM card. I later learned that my phone was not international and I unfortunately did not call AT&T ahead to unlock it, causing the phone to lock network access. I learned that this is a security feature in case your phone is stolen.
I'm asking for your help because I spent literally over an hour with tier one and tier two support of both AT&T and Motorola technical support all telling me the same BS.
Before calling any support numbers, I went to an AT&T branch, and I told them the situation. They replaced my AT&T SIM card with a new one, yet the phone still asked for the SIM network unlock PIN. They then told me to call support and ask them about a subsidy unlock code. AT&T phone support gave me multiple codes to unlock the phone, but none of them worked. All of the SIM and IMEP numbers on the phone were correct in their systems too. After telling me exactly the same thing as tier 1 support, AT&T tier 2 then transferred me to common Motorola support tier 1 support. Motorola only told me to hard reset the phone, which I do multiple times every time I update your firmware anyway. The last hard reset I did to my device was literally 30 minutes before I called technical support. They then told me that the only thing I could do is to replace the phone under warranty with either motorola or AT&T.
However, I am in a pickel becuase my phone is completly unlocked, rooted, has CFW/kernel, etc...and I think that wards the warranty.
I have been using this same firmware ever since I got this phone during the last summer, and it has been working perfectly. After I put in the Italian SIM card, the network locks. I have no where else to turn but to an expert here on xda.
Is there anything I can do? The only thing I can think of is to tell my story to a nonobservant AT&T guy over at a store and ask him to replace it. However, I don't know what would happen if they found out my phone is unlocked and they gave me a new phone under warranty before realizing this...
Thanks
eurosport360 said:
I am urgently in need of someone who can solve this network problem I have been having. Right now I can not access any mobile network with this phone.
I am using an Atrix 4g unlocked and rooted.
Basically, my problem is that my phone has been asking me for a "SIM network unlock PIN" every since my time in Italy.
I recently went to Italy 2 weeks ago, and came back yesterday. On my first day in Italy I bought an Italian SIM card from the Mobile Network company Tre, a company similar to AT&T. When I replaced my AT&T network card with the Tre one, it asked for the SIM network unlock pin. Seeing that I did not have a code on me at the time, and after trying several numbers given to my by Tre, I replaced the tre card with my original AT&T SIM card. I later learned that my phone was not international and I unfortunately did not call AT&T ahead to unlock it, causing the phone to lock network access. I learned that this is a security feature in case your phone is stolen.
I'm asking for your help because I spent literally over an hour with tier one and tier two support of both AT&T and Motorola technical support all telling me the same BS.
Before calling any support numbers, I went to an AT&T branch, and I told them the situation. They replaced my AT&T SIM card with a new one, yet the phone still asked for the SIM network unlock PIN. They then told me to call support and ask them about a subsidy unlock code. AT&T phone support gave me multiple codes to unlock the phone, but none of them worked. All of the SIM and IMEP numbers on the phone were correct in their systems too. After telling me exactly the same thing as tier 1 support, AT&T tier 2 then transferred me to common Motorola support tier 1 support. Motorola only told me to hard reset the phone, which I do multiple times every time I update your firmware anyway. The last hard reset I did to my device was literally 30 minutes before I called technical support. They then told me that the only thing I could do is to replace the phone under warranty with either motorola or AT&T.
However, I am in a pickel becuase my phone is completly unlocked, rooted, has CFW/kernel, etc...and I think that wards the warranty.
I have been using this same firmware ever since I got this phone during the last summer, and it has been working perfectly. After I put in the Italian SIM card, the network locks. I have no where else to turn but to an expert here on xda.
Is there anything I can do? The only thing I can think of is to tell my story to a nonobservant AT&T guy over at a store and ask him to replace it. However, I don't know what would happen if they found out my phone is unlocked and they gave me a new phone under warranty before realizing this...
Thanks
Click to expand...
Click to collapse
Ahh, perm SIM locked.
Pretty sure that has to go back to the manufacturer to be fixed, if it can be fixed at all.
Just go ask for a replacement, they shouldn't be able to unlock it anyways.
Longcat14 said:
Ahh, perm SIM locked.
Pretty sure that has to go back to the manufacturer to be fixed, if it can be fixed at all.
Just go ask for a replacement, they shouldn't be able to unlock it anyways.
Click to expand...
Click to collapse
thanks for the reply.
However, two things:
1) I thought it might be permanent, but I was not sure. Back in Italy I remember the phone giving me a certain number of try's, so I now that I think of it I might have exceeded that, causing it to perm lock. Is there any other way in telling if it's perm locked?
2) Also, one of my concerns is that AT&T will see that my phone is unlocked and rooted and all of that, thus warding the warranty and the replacement. I'm thinking that maybe after I give them this phone and I get a new one, they look at the old phone in the future and will see that its rooted and unlocked. Is this possible or what?
eurosport360 said:
thanks for the reply.
However, two things:
1) I thought it might be permanent, but I was not sure. Back in Italy I remember the phone giving me a certain number of try's, so I now that I think of it I might have exceeded that, causing it to perm lock. Is there any other way in telling if it's perm locked?
2) Also, one of my concerns is that AT&T will see that my phone is unlocked and rooted and all of that, thus warding the warranty and the replacement. I'm thinking that maybe after I give them this phone and I get a new one, they look at the old phone in the future and will see that its rooted and unlocked. Is this possible or what?
Click to expand...
Click to collapse
1) Just putting your sim card in and having the phone not respond pretty much sums up the sim lock.
2) I would at least revert the phone back to stock. AFAIK, unlocking the bootloader burned some sort of efuse so returning it back to a true factory state is "technically" impossible, but I do remember seeing that you could at least relock(?) and removed the unlocked notification at boot. I believe you should still be able to access the phone even when the sim has been locked, just start it without a sim card in place. If you can bring it back to an AT&T build, I think you'll be okay if you're still under warranty.
Just remember that next time you travel, either have an unlocked GSM phone or get a sim subsidy code from the carrier that the phone is linked to.
Would getting a code from cellunlock.net work? Or is their code the same as the ones given to me by AT&T tech support?
AT&T tech support gave me three '8 digit numbers', which were randomly generated. None of those worked. DO you think a cellunlock number would work?
Also, I am reading up on some forums saying that people in my situation (who's phone does not accept any SIM card and still askes for the code), can get the phone to accept some codes by reverting to stock firmware and radio. This is by .sbf though....
If things haven't changed, I believe the sim subsidy unlock would only clear the phone for the next foreign sim card placed in the phone whereas a real unlock code would completely unlock the code. Once your phone has been locked though, I don't think that code will be of use anymore.
It wouldn't hurt to try to sbf back to a stock build provided you follow the proper instructions to not get the x1000 hard bricks. Aside from trying that, I would think your best bet would be to just get the phone exchanged under warranty.
Sent from my Galaxy Nexus using Tapatalk
SIM lock
Looks like you have locked your SIM. Since you have rooted your phone you voided your warranty , best bet is look for SIM unlock code from online probably ebay will give you cheaper options, try them if worked great if not then there is a tool to root/unroot any android device, I will post the download link once i find. restore the device to factory settings if it permits and unroot back . then claim for replacement.
Hi i just unlock my device after hours of investigation. You have to change the baseband. Here is what you have to do. Flash the baseband to the ones from brazil (search in google sbf not the zip ones), after the process you can put it back to the usa at&t radio. Ones you change to tha brazil radio (wipe always before changes radio), put one sim card of another provider and voila, the code will work. You need to have your phone with no registration of motoblur at all.
I hope it will help you.
Enviado desde mi MB860 usando Tapatalk 2
kemoli said:
Hi i just unlock my device after hours of investigation. You have to change the baseband. Here is what you have to do. Flash the baseband to the ones from brazil (search in google sbf not the zip ones), after the process you can put it back to the usa at&t radio. Ones you change to tha brazil radio (wipe always before changes radio), put one sim card of another provider and voila, the code will work. You need to have your phone with no registration of motoblur at all.
I hope it will help you.
Enviado desde mi MB860 usando Tapatalk 2
Click to expand...
Click to collapse
Hey this metod works with an lg p930 too?

Network sim unlock pin tmousa?

I'm having a dispute with tmousa regarding them locking my phone to their network. I own my phone but put one of their prepaid sim cards in my phone. I guess they thought it was one of their phones and they locked my imei number to their network. Now for over a month I have been trying to get them to provide me with the network sim unlock pin so I can take my phone to another network but they're saying my phone has been modified and they can't find my imei number in their database so my phone is basically a brick now. They claimed they contacted HTC to get the number with no luck. Is there anything that I can possibly do now? Thanks.
11PCX said:
I'm having a dispute with tmousa regarding them locking my phone to their network. I own my phone but put one of their prepaid sim cards in my phone. I guess they thought it was one of their phones and they locked my imei number to their network. Now for over a month I have been trying to get them to provide me with the network sim unlock pin so I can take my phone to another network but they're saying my phone has been modified and they can't find my imei number in their database so my phone is basically a brick now. They claimed they contacted HTC to get the number with no luck. Is there anything that I can possibly do now? Thanks.
Click to expand...
Click to collapse
IMO you should contact one of the ebay's unlockers and check if your IMEI is unlockable(it is cheap to unlock, about 2-5US$).
11PCX said:
I'm having a dispute with tmousa regarding them locking my phone to their network. I own my phone but put one of their prepaid sim cards in my phone. I guess they thought it was one of their phones and they locked my imei number to their network. Now for over a month I have been trying to get them to provide me with the network sim unlock pin so I can take my phone to another network but they're saying my phone has been modified and they can't find my imei number in their database so my phone is basically a brick now. They claimed they contacted HTC to get the number with no luck. Is there anything that I can possibly do now? Thanks.
Click to expand...
Click to collapse
Did you give them imei number shown in the phone software (not the back)?
Wow thanks for the eBay tip! Just paid for the code so waiting for it now... I thought this was a different type of lock. I thought the Rom itself (tbd sense) unlocked the phone to other networks but I tried a wipe and re-flash and it was still locked so I should have asked the question sooner. Will post the result.
11PCX said:
Wow thanks for the eBay tip! Just paid for the code so waiting for it now... I thought this was a different type of lock. I thought the Rom itself (tbd sense) unlocked the phone to other networks but I tried a wipe and re-flash and it was still locked so I should have asked the question sooner. Will post the result.
Click to expand...
Click to collapse
Also just so you know it was not the sim card you put in it that placed a lock on the device to just use T-Mobile. The lock was on the device from factory, all US cellular providers do this to all devices they sell. It is a effort by the providers to keep you from changing providers so easily. They figure if you have to buy another device to change providers you would not be so willing to change to another provider because it will hit you in the pocket book harder. It is a very under handed practice in my opinion and should not be illegal. We pay for ower devices and should be able to use them how we want and with what ever provider we want. But then again we live in the worlds greatest country right.......what a joke.
I have had an HD2 since they first arrived at T-Mobile. As stated, all phones in the US are carrier locked by default.
It was easy for me to have mine unlocked. I called T-Mobile and told them I would be traveling out of the country. I asked for the unlock, gave them my IMEI, and serial (maybe). That was all it took. I got a text message with the code.

T-Mobile S7 Edge in Canada

Hi guys,
I've recently purchased and S7 Edge thinking that it would be easy to unlock and use in Canada. The phone isn't on any blacklist that I can find and I've contacted T-Mobile and they said no problem for the unlock using the app. But every time I try the app to unlock it based on the email from T-Mobile the app says unlock failed: device is permanently unlocked. But none of my SIM cards work.
I'm wondering if I was to flash it to a Canadian carriers ROM would the device then work with a carrier here or would it still somehow be locked to T-Mobile?
Looking for some advice on what maybe I can do here. Love the phone but it's useless unless I can get a SIM to work.
ahlerl said:
Hi guys,
I've recently purchased and S7 Edge thinking that it would be easy to unlock and use in Canada. The phone isn't on any blacklist that I can find and I've contacted T-Mobile and they said no problem for the unlock using the app. But every time I try the app to unlock it based on the email from T-Mobile the app says unlock failed: device is permanently unlocked. But none of my SIM cards work.
I'm wondering if I was to flash it to a Canadian carriers ROM would the device then work with a carrier here or would it still somehow be locked to T-Mobile?
Looking for some advice on what maybe I can do here. Love the phone but it's useless unless I can get a SIM to work.
Click to expand...
Click to collapse
Locking/Unlocking is not dependable on which firmware your phone is. If your phone is locked/unlocked no matter what you flash it will stay the same.The unlocking process with the app, you will need a Tmobile sim in the first place to do it. After that, you will need to turn off your phone and introduce the non-tmobile sim. When you introduce the non-tmobile sim, do you get a sim unlock message?
One thing that I noticed (I have 2 Tmobile S7 edge at the moment) is the unlocking app is not that accurate or Tmobile servers not up to date. I had a fully paid Tmobile that showed for months my phone was not eligible for unlocking, then one day that I decided to try it again and it showed it was unlocked.
It's weird because at one point it said it was unlocked.... But still wouldn't work... I've called t-mobile 3 times now and have gotten the different answers. First time no problem, will send you to the unlock team... They said use the app, to no avail. Next time, there's a balance owing on the phone you can't and you need an unlock code too, third time oh we'll do it just need to get you the unlock code....
Needless to say I never got an unlock code. And even though I checked the blacklist before getting it, t-mobile keeps their own so it may have a balance owing according to their site. Media device it is then I guess.

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