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[Q] LTE/WCDMA/GSM Problem "Not registered on network"

Dear Senior Member,
Please help me as I am stuck with the problem of mobile network in my Galaxy S6 Dual (SM-G920F). My mobile is upgraded recently with 5.1.1 ((PDA: G920FXXU2BOFL CSC: G920FOJV2BOEE CHANGELIST: 5012324 BUILD DATE: 22.06.2015) ). Main problem of my Galaxy S6 now is, when I select WCDMA/GSM or LTE/WCDMA/GSM or WCDMA, then my mobile network is not working and it shows error message "Not registered on network" and also it shows "Emergency calls only". But when I choose GSM only, then my call, message and mobile network work but internet speed is so slow. My upgradation is for that reason and now the same problem as earlier. I think so mane experts are here on Galaxy S6, Please help. I think it happens for Modem FIle or Stock firmware. Then which stock firmware is good for this problem. Please suggest.

Before flashing any ROM bring your S6 1st to your telecom provider for check-up since your S6 is still under warranty. Flashing ROM voids your warranty.

roydok said:
Before flashing any ROM bring your S6 1st to your telecom provider for check-up since your S6 is still under warranty. Flashing ROM voids your warranty.
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My phone is not under warranty. I have purchased it from a local shop and not from telecom provider. So what I can do now to get back the 3G connection. Can you please give any suggestion. Thanks.

rony0505 said:
My phone is not under warranty.
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Before updating did you have lte? Idk there was the region specific network block that Samsung put on its phone. Meaning if u bought a phone from Dubai and plan to use in US, u have to put a Dubai sim and make 5 minutes call to unlock the region network block to use it in US.

Fullmetal Jun said:
Before updating did you have lte? Idk there was the region specific network block that Samsung put on its phone. Meaning if u bought a phone from Dubai and plan to use in US, u have to put a Dubai sim and make 5 minutes call to unlock the region network block to use it in US.
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Thank you Fullmetal for your reply. I am using S6 and UK written on backside of the phone. I am using it in Bangladesh. Is there any other way to unlock regional network?

rony0505 said:
Thank you Fullmetal for your reply. I am using S6 and UK written on backside of the phone. I am using it in Bangladesh. Is there any other way to unlock regional network?
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Either find a uk sim or try some guides in youtube on how people unlocked other new samsungs(Note 3, 4) as should be mostly same for s6! Otherwise you'll have to pay and get it unlocked from a Samsung official shop in Bangladesh or your mobile carrier/service centre.
"Hit thxs button if I helped"

Fullmetal Jun said:
Either find a uk sim or try some guides in youtube on how people unlocked other new samsungs(Note 3, 4) as should be mostly same for s6! Otherwise you'll have to pay and get it unlocked from a Samsung official shop in Bangladesh or your mobile carrier/service centre.
"Hit thxs button if I helped"
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Any youtube link mate? I am not able to use 3g and this was from the begining. Please help.

I am from Bangladesh. Please suggest Firmware version for My Galaxy S6 (SM- G920F) DUos. THanks.

Flash this stock UK 5.1.1 for maximum benefits since your S6 is from UK:
http://www.sammobile.com/firmwares/download/50033/G920FXXU2BOFJ_G920FBTU2BOFJ_BTU/

roydok said:
Flash this stock UK 5.1.1 for maximum benefits since your S6 is from UK:
http://www.sammobile.com/firmwares/download/50033/G920FXXU2BOFJ_G920FBTU2BOFJ_BTU/
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Thank you for reply. I will definitely flash with this one. Hope my problem can be fixed. I am in Bangladesh, Is that create any problem of flashing UK version? Like 3G connection, Call, Text etc?

No problems with using UK ROM S6 in Bangladesh.

roydok said:
Flash this stock UK 5.1.1 for maximum benefits since your S6 is from UK:
http://www.sammobile.com/firmwares/download/50033/G920FXXU2BOFJ_G920FBTU2BOFJ_BTU/
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roydok said:
No problems with using UK ROM S6 in Bangladesh.
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Same problem as before.
Model: GALAXY S6 (SM - G920FD/G920F) DUAL SIM
SIM 1 > GSM ONLY > CALL, Message & Internet (Slow speed as 2G) without problem
SIM 2 > GSM ONLY > CALL, Message & Internet (Slow speed as 2G) without problem
IF CHOOSE
SIM 1 > LTE/WCDMA/GSM(Auto connect) OR WCDMA/GSM OR WCDMA ONLY > SHOW EMERGENCY CALL ONLY
SIM 2 > LTE/WCDMA/GSM(Auto connect) OR WCDMA/GSM OR WCDMA ONLY > SHOW EMERGENCY CALL ONLY
Is it the problem of dual Sim or what?

Galaxy S7 duos 4g/lte mhz???

Hi everybody.
I'm from Italy. In Italy we haven't got galaxy s7 in dual sim version, but i need it.
I can buy it outside Europe, through e-commerce. The problem is that the seller doesn't know the precise code of the model, he only knows that is dual sim and sim free. I would to know if there are different models of galaxy s7 duos sim free, and what are the 4g/lte frequency, to understand if it's compatible with italian sim operators.
Thank you.

buddy15 said:
Hi everybody.
I'm from Italy. In Italy we haven't got galaxy s7 in dual sim version, but i need it.
I can buy it outside Europe, through e-commerce. The problem is that the seller doesn't know the precise code of the model, he only knows that is dual sim and sim free. I would to know if there are different models of galaxy s7 duos sim free, and what are the 4g/lte frequency, to understand if it's compatible with italian sim operators.
Thank you.
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There are 2 that i know of.
SM-G930FD - This is the "European" model, u can install Single Sim ROM and Dual sim will work ( faster updates from samsung )
SM-G9300 - Chinese / Vietnam version , no Google Play and some Chinese apps .
About bands, read on those 2 pages

Thank you a lot.
We waiting for other utents if they know other versions.
A question: what means "u can install Single Sim ROM and Dual sim will work"? Is it necessary to change ROM to use the telephone?

buddy15 said:
Thank you a lot.
We waiting for other utents if they know other versions.
A question: what means "u can install Single Sim ROM and Dual sim will work"? Is it necessary to change ROM to use the telephone?
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No, i just did it because mine came with CSC for Nigeria. I choose an rom for XEU ( UK/Ireland Unbranded ) because they receive updates faster then others, and is closer to me then Nigeria ^^

ok, i understand.
Is this procedure invalidate warranty?

buddy15 said:
ok, i understand.
Is this procedure invalidate warranty?
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No
Even Knox remains the same, because u flash the stock rom not modified

Samsung Pay

Hi,
I purchased my S7 from UK recently but am based in Singapore. Is there anyway to get Samsung Pay on it?
I have a local Singapore Bank account and can use it with the Samsung Pay as I understand the Samsung Pay is tied to local bank accounts. I wish to do so without tripping Knox (no root to do it - as i might utlize warranty when i visit UK occasionally), and apparently getting the Samsung Pay download can be via changing the CSC. How would one go about doing it?
Also, will changing the CSC via Odin trip Knox?
Thanks!

SGiZac said:
Hi,
I purchased my S7 from UK recently but am based in Singapore. Is there anyway to get Samsung Pay on it?
I have a local Singapore Bank account and can use it with the Samsung Pay as I understand the Samsung Pay is tied to local bank accounts. I wish to do so without tripping Knox (no root to do it - as i might utlize warranty when i visit UK occasionally), and apparently getting the Samsung Pay download can be via changing the CSC. How would one go about doing it?
Also, will changing the CSC via Odin trip Knox?
Thanks!
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Click to collapse
Hi mate
You are right you need the correc CSC in order to get Samsung PAy to work ( as long as is available in you country)
two options flash a stock rom from your country from sammobile
http://www.sammobile.com/firmwares/
Or check this thread
http://forum.xda-developers.com/galaxy-s7/how-to/official-stock-firmware-update-odin-t3369431
Flashing stock firmware with odin will not trip knox.

MAX 404 said:
Hi mate
You are right you need the correc CSC in order to get Samsung PAy to work ( as long as is available in you country)
two options flash a stock rom from your country from sammobile
http://www.sammobile.com/firmwares/
Or check this thread
http://forum.xda-developers.com/galaxy-s7/how-to/official-stock-firmware-update-odin-t3369431
Flashing stock firmware with odin will not trip knox.
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Click to collapse
I don't really understand how home country firmware affects the use of SAmsung Pay. I have a duos S7 with United Arab Emirates firmware, which is not part of the list of countries where it is available according to Samsung site, yet I'm able to successfully sideload the apps and use S Pay here in the U.S.A. Maybe that's just a quirk of the duos S7?

ChristopherXDA said:
I don't really understand how home country firmware affects the use of SAmsung Pay. I have a duos S7 with United Arab Emirates firmware, which is not part of the list of countries where it is available according to Samsung site, yet I'm able to successfully sideload the apps and use S Pay here in the U.S.A. Maybe that's just a quirk of the duos S7?
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Hi
Not so much the firmware but the CSC ( Country Sales Code) may play a role as Samsung Pay is not available in all countries
http://www.samsung.com/global/galaxy/samsung-pay/
In your case been in USA and in a USA carrier may had been decisive
In the case of the G930F and G935F seems to play a role
http://forum.xda-developers.com/s7-edge/help/samsung-pay-g930f-g935f-international-t3340821

N915T using SM-N915F?

i've note edge buy from people in my country *Indonesia last month, when i check in about phone setting it's written Model Number "SM-N915F" that i know it is for Indonesia, but when i put off my battery it's written N915T that's for T-Mobile, so i'm confuse with my phone because i can't do an upgrade from setting/about/update and is it posible to flash N915F firmware to N915T?

adi.k01 said:
i've note edge buy from people in my country *Indonesia last month, when i check in about phone setting it's written Model Number "SM-N915F" that i know it is for Indonesia, but when i put off my battery it's written N915T that's for T-Mobile, so i'm confuse with my phone because i can't do an upgrade from setting/about/update and is it posible to flash N915F firmware to N915T?
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If it write T model in the back, then it is the T model because you can change the model number in about phone, so maybe the owner changed the model number before you bought the phone. Even so If you are undecided, you can hardreset ur phone and after succesfull bootup u can find out what the phone model is in about phone... :fingers-crossed:

ufukan said:
If it write T model in the back, then it is the T model because you can change the model number in about phone, so maybe the owner changed the model number before you bought the phone. Even so If you are undecided, you can hardreset ur phone and after succesfull bootup u can find out what the phone model is in about phone... :fingers-crossed:
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if i had reset my note edge, is it possible to use in my country? i'm afraid if T version isn't for use in Indonesia

No you can't.. on T-mobile version only 2G will work. no 3G or 4G..

Csc change

I bought my samsung galaxy s8 plus from dubai its csc code is xsg and i want to change my csc code to ins (india) can i change it without any problem ? and i use jio 4g now in my dubai s8 its shows 4g when i change ite csc than its show lte or not? Plz help

amanjain24 said:
I bought my samsung galaxy s8 plus from dubai its csc code is xsg and i want to change my csc code to ins (india) can i change it without any problem ?
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if you have a g955F or g955FD (which i believe both the arab emirates and india have) you can flash an indian csc without a problem.
amanjain24 said:
and i use jio 4g now in my dubai s8 its shows 4g when i change ite csc than its show lte or not? Plz help
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So you just want the symbol in statusbar to say lte instead of 4g? I really wonder why someone would care, but im pretty sure - when rooted - you can change this easily. Don't know if this changes with different CSCs tho.

Thanks
Thanks