Will changing the OS or factory resetting re-lock a lumia 640 phone? - Microsoft Lumia 950/950 XL

I just had someone ask me if they factory resetted or upgraded to windows 10 an unlocked at&t lumia 640 gophone will the phone re-lock?
Thanks.

no.. SIM lock status not change when you upgrade or flash phone

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Unlocked Vibrant + Factory Reset?

Guys,
I just had a quick question. Does anybody know if I do a factory reset on the phone, will it erase the SIM unlock that I did already from T-Mobile? My phone is extremely sluggish and locking up. However, Iam worried that doing a factory reset will "lock" the SIM again to T-Mobile. Any help is appreciated. Thank you!
You can unlock your phone as many times as needed with that code. The code is locked to your device!
It shouldn't remove the SIM unlock.
I have never tried with the Vibrant, but in me experience with about a dozen other unlocked GSM phones, a factory reset has never re-locked the phone.
cparekh said:
I have never tried with the Vibrant, but in me experience with about a dozen other unlocked GSM phones, a factory reset has never re-locked the phone.
Click to expand...
Click to collapse
and if the question is for samsung captative i897, me to unlocked the network sim pin from fastgsm software and got unlocked but after some days when i installed app on captative it got relock, when i entered the same code which i got before its not accepting, as i factory reset the mobile and deleted the apps does it effect the network sim pin please reply
I have never had to unlock my phone since doing it the first time and I have ODINd to stock plenty as well as done factory resets.
pvspencer22 said:
I have never had to unlock my phone since doing it the first time and I have ODINd to stock plenty as well as done factory resets.
Click to expand...
Click to collapse
Yup, same here.
unknown amount of odin's and roms 2.3 included, never a relock.
Factory reset doesn't even have access to that partition.
You should be able to factory reset with no issues. Once that unlock code is in, that phone should stay unlocked for life.
no, but I wish it does because some people with corrupted imei are having a hard time to fix it.
anyways, you'll be fine.
Sent from my SGH-T959 using XDA App

[Q] does a factory reset re-lock a currently unlcoked vibrant?

so does a factory reset wipe out the unlock, and re-lock my vibrant to T-mobile?
If it does then just use the same unlock code because your EMEI doens't change. Correct me if I'm wrong.
No never
Sent from my Samsung Vibrant
Once unlocked always unlocked

[Q] Sim Unlock Vs Factory Unlock

I was going to use mobiletechvideos to root the N900T I am planning to buy for use on AT&T. I might even buy a factory unlocked phone.
They have an option called "sim unlock" - They say it is a lower level unlock. If I bought a factory unlocked phone, would a Sim unlock be necessary (if I travel internationally)?

[q] sim unlock pin

A friend got me a note 3 unlocked from the uk . i did a factory reset and now after booting , its asking for sim unlock pin. How's that possible? i have tried different sims but still same problem. can any help out . How do i regain access to my networks. Thanks
The imei is there . the baseband is intact nb1 but still it keeps asking for enter sim unlock pin
Probably some security software on there.
avast anti theft comes to mind.
It's activated when sim card is changed

Moto X Sprint lock sim again after flash firmware

i buy a Moto X Sprint XT1056, brandnew, and it's unlocked, Android 4.2.2. I use all sim GSM ok. But after i flash new FW, use RSDlite, android 4.4.4 . my phone's locked again, it show error sim card. How can I re unlock my phone?

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