Database Users

Had to get my phone unlocked, now 3G doesn't work.

I live in Bangladesh and got my Note 3 N9005 from Saudi Arabia. My parents were the one who got it for me. They used it there for making a few calls so that hopefully the phone wouldn't be region locked when I got it in Bangladesh. However, that didnt work and the phone was locked the moment I put in my sim card.
So I tried Chainfire's region lock away app hoping it would work but nope, that didnt work either.So I took my phone to a local shop hoping they would know how to disable the lock. They said it would take some more time because some files were missiong or were altered in some way because of Chainfire's app. Anyways, they were able to fix it but it took some time.
However, I noticed a new problem when I put in my sim card at home. I can't use 3G now. I only get Edge speeds now. I assumed the phone should automatically connect to 3G but nothing is happening. There are no settings either. WCDMA doesn't work either. I just get an error message when I select that. So I'm in a pinch right now, can anyone help me out here? Is there any way this issue can be fixed? Perhaps if I update to 4.4.2? I really don't know what to do here guys

Sway212 said:
I live in Bangladesh and got my Note 3 N9005 from Saudi Arabia. My parents were the one who got it for me. They used it there for making a few calls so that hopefully the phone wouldn't be region locked when I got it in Bangladesh. However, that didnt work and the phone was locked the moment I put in my sim card.
So I tried Chainfire's region lock away app hoping it would work but nope, that didnt work either.So I took my phone to a local shop hoping they would know how to disable the lock. They said it would take some more time because some files were missiong or were altered in some way because of Chainfire's app. Anyways, they were able to fix it but it took some time.
However, I noticed a new problem when I put in my sim card at home. I can't use 3G now. I only get Edge speeds now. I assumed the phone should automatically connect to 3G but nothing is happening. There are no settings either. WCDMA doesn't work either. I just get an error message when I select that. So I'm in a pinch right now, can anyone help me out here? Is there any way this issue can be fixed? Perhaps if I update to 4.4.2? I really don't know what to do here guys
Click to expand...
Click to collapse
I doubt updating to 4.4.2 would fix anything.

Sway212 said:
I live in Bangladesh awand got my Note 3 N9005 from Saudi Arabia. My parents were the one who got it for me. They used it there for making a few calls so that hopefully the phone wouldn't be region locked when I got it in Bangladesh. However, that didnt work and the phone was locked the moment I put in my sim card.
So I tried Chainfire's region lock away app hoping it would work but nope, that didnt work either.So I took my phone to a local shop hoping they would know how to disable the lock. They said it would take some more time because some files were missiong or were altered in some way because of Chainfire's app. Anyways, they were able to fix it but it took some time.
However, I noticed a new problem when I put in my sim card at home. I can't use 3G now. I only get Edge speeds now. I assumed the phone should automatically connect to 3G but nothing is happening. There are no settings either. WCDMA doesn't work either. I just get an error message when I select that. So I'm in a pinch right now, can anyone help me out here? Is there any way this issue can be fixed? Perhaps if I update to 4.4.2? I really don't know what to do here guys
Click to expand...
Click to collapse
Flash firmware for your region from sammobile with odin. Make doubke sure you flash the firmware for n9005 though. Should fix

punkstoner said:
Flash firmware for your region from sammobile with odin. Make doubke sure you flash the firmware for n9005 though. Should fix
Click to expand...
Click to collapse
If I do that, will the region lock come back? And can I flash another region's firmware like Poland's 4.4.2 or should I not mess around and just get my region's one?

Sway212 said:
I live in Bangladesh and got my Note 3 N9005 from Saudi Arabia. My parents were the one who got it for me. They used it there for making a few calls so that hopefully the phone wouldn't be region locked when I got it in Bangladesh. However, that didnt work and the phone was locked the moment I put in my sim card.
So I tried Chainfire's region lock away app hoping it would work but nope, that didnt work either.So I took my phone to a local shop hoping they would know how to disable the lock. They said it would take some more time because some files were missiong or were altered in some way because of Chainfire's app. Anyways, they were able to fix it but it took some time.
However, I noticed a new problem when I put in my sim card at home. I can't use 3G now. I only get Edge speeds now. I assumed the phone should automatically connect to 3G but nothing is happening. There are no settings either. WCDMA doesn't work either. I just get an error message when I select that. So I'm in a pinch right now, can anyone help me out here? Is there any way this issue can be fixed? Perhaps if I update to 4.4.2? I really don't know what to do here guys
Click to expand...
Click to collapse
Brother i am from Bangladesh. I think i am facing the same problem. May i Have your contact number please?

shakil4all said:
Brother i am from Bangladesh. I think i am facing the same problem. May i Have your contact number please?
Click to expand...
Click to collapse
That's no good, you can't call each other's phones...
Seriously though not sure if region lock can be circumvented like that. Interesting if it could...

shakil4all said:
Brother i am from Bangladesh. I think i am facing the same problem. May i Have your contact number please?
Click to expand...
Click to collapse
Did you buy your phone from Bangladesh? I think I may have found a solution to our problem. Do you know your csc code? That may help me out. But it has to be bought from Bangladesh, else I cant do anything

Sway I Have the same problem. Using Airtel.
Can you please pm me your contact number. Really in need of help. And my one is from abroad.

[Q] how to fix SM-N900 network signal for UK mobile network?

Yes, I need help and guidance for this new Note 3 that my wife received gift from my mother-in-law (a bit jealous at that time) when we were in India but so far unable to use in UK network for long.
phone details:
Model number - SM-N900
Android version - 4.4.2
Baseband version - N900DDUDNA1
Kernal version -
3.4.39-679903
[email protected]#1
Wed Feb 12 17:49:20 KST2014
Build Number - KOT49H.N900XXUDNB2
Device Status - Official
The phone was sold to us as International unlocked phone in last week of february, we didn't put any SIM but once started the phone in Mumbai it didn't ask for any regional lock or sim unlock code so we were satisfied that phone is unlocked. We didn't test it with any SIM in India though. First we put the SIM in UK and as usual it didn't prompt for unlock code etc. straight we got signal on Three uk network
but signal only lasted around 1min. When I checked signal strength it kept changing and the phone gets no signal. Have been in constant touch with 3 Network in UK(london area) and they are confirming that this phone can work in UK on there network without any issue unless there is a hardware fault.
I have spent numerous hours resetting the phone/ selecting network/ trying SIMs from different provider but signal comes and goes. When its there I can make and receive calls without any problem.
Once I made a call for more than 12 mins but signal doesn't last that much anymore.
It goes like this in Mobile Network type - H --> H+ --> HSDPA then drops (with signal strenth -113dBm 0 asu) when asu is higher it works. All this happens within a minute time frame. The wifi works fine hence software updated.
Now I feel there is problem in its Antenna but I need expert advise before I send it back to India as Samsung UK refused to fix it since phone is not bought in UK (though I was ready to pay for it) but now I guess they don't have anybody in UK to repair such phones.
Please suggest to fix this issue if you or people in your network have had such issue before and how do I resolve it?
Kind regards,
londonuser

SM-N900 network signal issue
londonuser said:
Yes, I need help and guidance for this new Note 3 that my wife received gift from my mother-in-law (a bit jealous at that time) when we were in India but so far unable to use in UK network for long.
phone details:
Model number - SM-N900
Android version - 4.4.2
Baseband version - N900DDUDNA1
Kernal version -
3.4.39-679903
[email protected]#1
Wed Feb 12 17:49:20 KST2014
Build Number - KOT49H.N900XXUDNB2
Device Status - Official
The phone was sold to us as International unlocked phone in last week of february, we didn't put any SIM but once started the phone in Mumbai it didn't ask for any regional lock or sim unlock code so we were satisfied that phone is unlocked. We didn't test it with any SIM in India though. First we put the SIM in UK and as usual it didn't prompt for unlock code etc. straight we got signal on Three uk network
but signal only lasted around 1min. When I checked signal strength it kept changing and the phone gets no signal. Have been in constant touch with 3 Network in UK(london area) and they are confirming that this phone can work in UK on there network without any issue unless there is a hardware fault.
I have spent numerous hours resetting the phone/ selecting network/ trying SIMs from different provider but signal comes and goes. When its there I can make and receive calls without any problem.
Once I made a call for more than 12 mins but signal doesn't last that much anymore.
It goes like this in Mobile Network type - H --> H+ --> HSDPA then drops (with signal strenth -113dBm 0 asu) when asu is higher it works. All this happens within a minute time frame. The wifi works fine hence software updated.
Now I feel there is problem in its Antenna but I need expert advise before I send it back to India as Samsung UK refused to fix it since phone is not bought in UK (though I was ready to pay for it) but now I guess they don't have anybody in UK to repair such phones.
Please suggest to fix this issue if you or people in your network have had such issue before and how do I resolve it?
Kind regards,
londonuser
Click to expand...
Click to collapse
Spoke to Samsung UK no joy so back to forum for any help?

i
londonuser said:
Yes, I need help and guidance for this new Note 3 that my wife received gift from my mother-in-law (a bit jealous at that time) when we were in India but so far unable to use in UK network for long.
phone details:
Model number - SM-N900
Android version - 4.4.2
Baseband version - N900DDUDNA1
Kernal version -
3.4.39-679903
[email protected]#1
Wed Feb 12 17:49:20 KST2014
Build Number - KOT49H.N900XXUDNB2
Device Status - Official
The phone was sold to us as International unlocked phone in last week of february, we didn't put any SIM but once started the phone in Mumbai it didn't ask for any regional lock or sim unlock code so we were satisfied that phone is unlocked. We didn't test it with any SIM in India though. First we put the SIM in UK and as usual it didn't prompt for unlock code etc. straight we got signal on Three uk network
but signal only lasted around 1min. When I checked signal strength it kept changing and the phone gets no signal. Have been in constant touch with 3 Network in UK(london area) and they are confirming that this phone can work in UK on there network without any issue unless there is a hardware fault.
I have spent numerous hours resetting the phone/ selecting network/ trying SIMs from different provider but signal comes and goes. When its there I can make and receive calls without any problem.
Once I made a call for more than 12 mins but signal doesn't last that much anymore.
It goes like this in Mobile Network type - H --> H+ --> HSDPA then drops (with signal strenth -113dBm 0 asu) when asu is higher it works. All this happens within a minute time frame. The wifi works fine hence software updated.
Now I feel there is problem in its Antenna but I need expert advise before I send it back to India as Samsung UK refused to fix it since phone is not bought in UK (though I was ready to pay for it) but now I guess they don't have anybody in UK to repair such phones.
Please suggest to fix this issue if you or people in your network have had such issue before and how do I resolve it?
Kind regards,
londonuser
Click to expand...
Click to collapse
it s too far to be hardware problem.
u can do this;
1. flash SM-N900 UK ROM /u can find firmware on sammobile.com/firmware
or
2. flash just its modem firmware /u can find in dev section
if nothing happen after 2-3 times flashing different stock firmware of uk and modem u should ask for replacement.
:good:

x102x96x said:
it s too far to be hardware problem.
u can do this;
1. flash SM-N900 UK ROM /u can find firmware on sammobile.com/firmware
or
2. flash just its modem firmware /u can find in dev section
if nothing happen after 2-3 times flashing different stock firmware of uk and modem u should ask for replacement.
:good:
Click to expand...
Click to collapse
Many thanks for reply as suggested
for option 1 - I tried before and now as well on sammobile when I select N900 I do not get UK in the country dropdown list to select the different firmware, whatever firmware they have for india is already updated on my phone
that leaves option 2 which I am more interested in because when I restart the modem using any app it comes back quickly but again goes dead.
I am new user so can't post any request in Dev section and searched but couldn't find it. is there any specific search term I need to use to get modem firmware for UK for my N900?

i
londonuser said:
Many thanks for reply as suggested
for option 1 - I tried before and now as well on sammobile when I select N900 I do not get UK in the country dropdown list to select the different firmware, whatever firmware they have for india is already updated on my phone
that leaves option 2 which I am more interested in because when I restart the modem using any app it comes back quickly but again goes dead.
I am new user so can't post any request in Dev section and searched but couldn't find it. is there any specific search term I need to use to get modem firmware for UK for my N900?
Click to expand...
Click to collapse
Odin flashable modems for Samsung Galaxy NOTE 3 - SM-N900
but search more in google
some words like this;
SM-N900 Modem Flash zip
SM-N900 ROM Flash zip
& ...
please hit thanks instead of typing

What I think z although the phone is unlocked the band frequency which the phone supports doesn't match thr 3g network in uk.If u send ur phone in India it will definitely work.If there z 2g network in UK,have u tried?If u don't want to send it just root it(warranty lost)& flash uk based modem & hope so ur problem will be solved
Sent from my SM-N900 using XDA Premium 4 mobile app

RISHI RAJ said:
What I think z although the phone is unlocked the band frequency which the phone supports doesn't match thr 3g network in uk.If u send ur phone in India it will definitely work.If there z 2g network in UK,have u tried?If u don't want to send it just root it(warranty lost)& flash uk based modem & hope so ur problem will be solved
Sent from my SM-N900 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Thanks for reply, thats why I am here, I am aware that if I send it to India it will work. But I want it to work in UK so seeking some guidance in that regard, so far unable to find required modem for UK networks

x102x96x said:
Odin flashable modems for Samsung Galaxy NOTE 3 - SM-N900
but search more in google
some words like this;
SM-N900 Modem Flash zip
SM-N900 ROM Flash zip
& ...
please hit thanks instead of typing
Click to expand...
Click to collapse
This is just to let you know there has been a progress, I only flashed the modem and its not lost signal since last hour so fingers crossed I will update once I watch out for next day or two.
Many thanks for your help, really appreciated !

londonuser said:
This is just to let you know there has been a progress, I only flashed the modem and its not lost signal since last hour so fingers crossed I will update once I watch out for next day or two.
Many thanks for your help, really appreciated !
Click to expand...
Click to collapse
Please let me know if the problem got solved, i have the same problem, one more question for you, do u have kit kat installed on your phone?

NOTE 3 not picking up 3G signal.

hi everyone,
It's my first time i post on this forum, i am a noob.
In brief i just brought an GALAXY NOTE 3 (SM-N9005) a week ago from a seller but just yesterday i realized that my phone work only on GSM and can t pick up 3G signal at all even if i am in a area where there is cover. i searched the net hours and hours but didn t find a clear answer.
Please can someone figure out what is the problem and how to fix it.
Here are my information:
I am from Morocco,my operator is MEDITEL(i tried others operators here "INWI" and "IAM" it doesn t work either no 3G signal ), my Note 3 is under KitKat 4.4.2,
For more information about the phone look at the screenshots in the attachement.
The phone is STOCK not ROOTED i didn t mess anything yet.
The phone is from Spain and the carrier is Orange because at boot the is the orange boot logo.
It will be soo nice if anybody can help me. I really like my phone but if it doesn t work like it should its a shame. Here in morocco high end smartphones are expensive and no warranty unless you buy it from from samsung store where is more expensive.

Did you enter the APN settings?
Send From My Samsung Galaxy Note 3 N9005 Using Tapatalk

ShadowLea said:
Did you enter the APN settings?
Send From My Samsung Galaxy Note 3 N9005 Using Tapatalk
Click to expand...
Click to collapse
Yes i tried i get G (GPRS) but the problem still there no 3G signal. I think the CSC might be the problem

_walid_ said:
Yes i tried i get G (GPRS) but the problem still there no 3G signal. I think the CSC might be the problem
Click to expand...
Click to collapse
Yes it might be the problem with CSC, but:
- Did you try your SIM card with another smartphone and have success with the 3G connection?
- In the Phone INFO *Samsung* app, enter the Menu and select [Note 3] Fake Detector, tell me what does it say? What is the Diag Code?

vndnguyen said:
Yes it might be the problem with CSC, but:
- Did you try your SIM card with another smartphone and have success with the 3G connection?
- In the Phone INFO *Samsung* app, enter the Menu and select [Note 3] Fake Detector, tell me what does it say? What is the Diag Code?
Click to expand...
Click to collapse
-Yes, my sim card worked just fine in my sister's xperia S 3G with full bars.
-When i select note 3 fake detector it give me error and when i hit yes nothing happen.
One thing i noticed my IMEI in the box is the same in the back of the phone behind the battery BUT it s not the same when i dial *#06# even the serial number is different.

_walid_ said:
-Yes, my sim card worked just fine in my sister's xperia S 3G with full bars.
-When i select note 3 fake detector it give me error and when i hit yes nothing happen.
One thing i noticed my IMEI in the box is the same in the back of the phone behind the battery BUT it s not the same when i dial *#06# even the serial number is different.
Click to expand...
Click to collapse
1- This error related to my app. I will fix it soon. Sorry about that.
2- There is a big chance that your phone is a refurbished one. Because it has NONE manufacturing date, and the IMEI does not match with the one on the label.
Can you PM me full info from the Phone INFO app?
---------- Post added at 07:13 PM ---------- Previous post was at 06:26 PM ----------
I have looked at your screenshots you sent me.
Your device doesnt have manufacturing date and hardware revision info, so the big chance is that your phone is a refurbished one.
If you can return it to the shop where you bought, I think it is the best choice for you now.
Sorry to say about that.

_walid_ said:
-Yes, my sim card worked just fine in my sister's xperia S 3G with full bars.
-When i select note 3 fake detector it give me error and when i hit yes nothing happen.
One thing i noticed my IMEI in the box is the same in the back of the phone behind the battery BUT it s not the same when i dial *#06# even the serial number is different.
Click to expand...
Click to collapse
Hi mate,
I've just updated my app.
Could you please update the app from Play Store (v1.5.0), then enter the Menu and select '[Note 3] Fake Detector', and check for the Diag Code again?
Thank you.

vndnguyen said:
Hi mate,
I've just updated my app.
Could you please update the app from Play Store (v1.5.0), then enter the Menu and select '[Note 3] Fake Detector', and check for the Diag Code again?
Thank you.
Click to expand...
Click to collapse
Ok i did what you said, and it gives me The Diag Code=0000
What does it mean?

_walid_ said:
Ok i did what you said, and it gives me The Diag Code=0000
What does it mean?
Click to expand...
Click to collapse
Ok 0000 means nothing new.
But did you see 2 warning messages? It is not a good one. Can you return it to the shop?

same problem with set like this now i can use 3/4g

vndnguyen said:
Ok 0000 means nothing new.
But did you see 2 warning messages? It is not a good one. Can you return it to the shop?
Click to expand...
Click to collapse
I called the seller and he told me to bring back the phone so he can find what is the problem. For returning the phone i don t think he will accept, firstly ther is no warranty and secondly the phone was sealed with samsung,he didn t open the box then its not he's fault.
If he didn't fix it i will just live without 3G
Thanks a lot vndnguyen and sorry for wasting your time. Btw flashing another modem (CSC) wouldn't fix it?

nirutbst said:
same problem with set like this now i can use 3/4g
Click to expand...
Click to collapse
can you please be more specific. You can use only 3/4G no 2G?or what?
My problem is when i switch to 3G only, i get "Selected network unavailable" even if i am in an area with 3G cover

Hi!
I have same problem.
I Live in Finland. 3 month I used DNA operator, was all perfect. Now I connect to Sonera and work only 2G connection.
I flashed 3 different ROM, flashed 2 different modem ROM, finally I flashed 4 files Poland ROM and use it like it is.
2G worked propertly, 3G don't connect.:crying:
Mobile broadband work correct at all settings.
Can't find way out...

[Q] Need Help Network not registered

i brought up refurbished Samsung S4 I9505 from china for my wife. i just make 1 call .after that i try to call it says "network not registered" . I TRY ALMOST tips and tricks that available on net but no progress. i update my phone Lollipop 5.0.1 but still got "network not registered". please anybody help me what can i do. i already try to flash MODEM but nothing change. i try service mode it shows "GSM900: Limited". but i see one thing sometimes its change to "GSM1800: Available" my phone make a call successfully. please friends tell me what can i do.

picky93 said:
i brought up refurbished Samsung S4 I9505 from china for my wife. i just make 1 call .after that i try to call it says "network not registered" . I TRY ALMOST tips and tricks that available on net but no progress. i update my phone Lollipop 5.0.1 but still got "network not registered". please anybody help me what can i do. i already try to flash MODEM but nothing change. i try service mode it shows "GSM900: Limited". but i see one thing sometimes its change to "GSM1800: Available" my phone make a call successfully. please friends tell me what can i do.
Click to expand...
Click to collapse
Refurbished and China seems Frankestein.

If it's a Frankenstein as Joku1981 suggests, run, don't walk, and get your money back.

Joku1981 said:
Refurbished and China seems Frankestein.
Click to expand...
Click to collapse
what can i do now please help me. i upload pic about samsung info.

It's clearly not a Frankenstein, so that's good news. What carrier are you using?

In the first pic at the last line you can read imei cert:NA that mean that your phone has loose its imei certificat.
so you can return it and have your money back or give it to a sepecialized shop to push a new certificat with a box
PS: i have an i9500 and mine show : Imei cert: fail

@sentinelle20: "IMEI Certi: NA" is normal on the S4. I can confirm this because my S4 has the same readout and yet it works perfectly. On the S5 it may make a difference. See here for details.

Ok ggod to know...
in my working i9500 the last line says imei cert : pass

Strephon Alkhalikoi said:
It's clearly not a Frankenstein, so that's good news. What carrier are you using?
Click to expand...
Click to collapse
i am using Mobilink but i tried all MM that available in Pakistan but mobile give same behavior. i am unable to understand why some time mobile registered on network and works fine? do you think its a hardware problem? give me any idea what can i do

Refresh my memory. The SIM works properly in another phone?

Strephon Alkhalikoi said:
Refresh my memory. The SIM works properly in another phone?
Click to expand...
Click to collapse
yes my sim work,s fine in any phone , i tried many sim in my phone but result is same. please tell me why some time phone work properly ? do you think its a hardware problem? because i upgrade its room many time but same result.

If you've tried multiple SIM cards in the S4 and all of them aren't working, then you definitely have a hardware issue. Either the SIM card tray has died or the fault lies in the motherboard. From experience, replacing the SIM card tray is both the least expensive route and the easiest, being something that you can do yourself. Replacement trays cost about US$10, a small phillips screwdriver, a half hour of your time, and the foam pad that sits on top of the connector of the original tray.
You purchased this as a refurb unit however, so you should have a warranty of some sort. Take it back to where you got it from and have them look at it.

No signal on stock rom

So,
I was using my XT-1563 on a CyanogenMod in one of my local carriers. I bought a new phone and decided to sell this one, so I went back and installed stock rom. So far everything was ok.
The problem came when the person that was buying it tried to use her simcard. The phone didn't show any error, but it never connected to that network. Then I tried another sim from different carrier and it didn't work either (but it does work using my old simcard). It recognizes there's a new simcard, but fails to connect, only allowing emergency calls.
I've been trying all day to fix this. I have flashed nearly half of all the stock roms available, obviously starting with those from my zone, but so far none has worked.
I also tried the simcard into my new phone and it works just fine.
So, I know the following:
- The simcard is ok.
- It's not a signal problem (I have tested it in different parts of the city and zones I know have very good signal).
- The phone works using a simcard from one carrier, but not the others (and it doesn't ask me for some unlock code).
Thanks in advance for any help, it'll be greatly appreciated.

DemianStark said:
So,
I was using my XT-1563 on a CyanogenMod in one of my local carriers. I bought a new phone and decided to sell this one, so I went back and installed stock rom. So far everything was ok.
The problem came when the person that was buying it tried to use her simcard. The phone didn't show any error, but it never connected to that network. Then I tried another sim from different carrier and it didn't work either (but it does work using my old simcard). It recognizes there's a new simcard, but fails to connect, only allowing emergency calls.
I've been trying all day to fix this. I have flashed nearly half of all the stock roms available, obviously starting with those from my zone, but so far none has worked.
I also tried the simcard into my new phone and it works just fine.
So, I know the following:
- The simcard is ok.
- It's not a signal problem (I have tested it in different parts of the city and zones I know have very good signal).
- The phone works using a simcard from one carrier, but not the others (and it doesn't ask me for some unlock code).
Thanks in advance for any help, it'll be greatly appreciated.
Click to expand...
Click to collapse
So, did you ever carrier unlock the phone? I realize it's not asking for a code, but you never said you actually unlocked it.
Sent from my XT1563 using XDA-Developers mobile app

scottdanpor said:
So, did you ever carrier unlock the phone? I realize it's not asking for a code, but you never said you actually unlocked it.
Sent from my XT1563 using ...
Click to expand...
Click to collapse
At this point I'm not 100% sure.
When I bought the phone it was supposed to be unlocked (I got it from someone else) and I'm pretty sure it was, because it was originally bought for one carrier (Entel Chile) and then I used it with another one (Wom Chile). By law, every phone sold in Chile since a few years is mandatory unlocked and this one is not that old (2015).
Right now it only works with Wom Chile, even tho I've installed Entel's stock rom. I think it's some baseband issue from what I've read, but I can't be sure.
P.S: Sorry for bad english.

Yes u r right
i used cm14 on xt1562, i'v feel my network was drop around 30-40% specially on Reliance JIO 4G VOILET.
Over all - rom is good for enjoy but not for stability