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Mate 8 - 3g/4g Sim Card Slot - "Locked"? - Summarized

Firstly let me apologize for duplicating the content of several other topics. This post will intend to summarize the issue in order to provide better visibility to anyone trying to help.
To start off, I have the same problem with my Mate 8.
The Issue
The Huawei Mate 8 has two Sim Card Slots: one supports 3g/4g and the other supports only 2g. That's how it's build.
When you pun in non-China Telecom card into *either* of the slots a message pops up saying that 3g/4g is only supported on China Telecom: https://tj6nvw-bn1306.files.1drv.com/y3p0MIG3qgLckpGbYHxgH70oReY058UmP2hfiLYG-HZPelszWa8XkA5gqwtKldaPY54l0lK91_XhjKz149GjRW6H06HJyAdEN7dXS8GzEWZyDvEiUeg7moZtmEGVG3nFj-qqywRCQTzYESnpN5IGyuD7w/Screenshot_2016-01-26-14-08-52%20%281%29.png?psid=1
More Details
It is possible to change the active 3g/4g card slot via settings configuration.
You can use 2g capabilities in *any* of the physical slots (via configuration above)
When you insert 2 sim cards only one of them is active. The device does *not* recognize the second card. It is possible to switch between the two cards, but only one of them can be active.
The problem is reported only for CL00 & TL00 models (and not the AL10 or L29 ones).
What is tried already?
I've tried and confirm all the items above.
Did factory reset.
I've loaded the International Software to Mate 8 from this topics
The Chinese Telecom message no longer appears on the International Software, however the slot still doesn't work.
Did factory reset on the international Software as well.
Tried to unlock it via DC-Unlocker - it is not possible. The "Unlock" button is grayed out.
The Sim Status in DC-Unlocker is "unlocked" however it shows only one IMEI number, where the phone has 2 IMEI numbers if you check it via *#06#
Guys report the same problem with Verizon cards, where Verizon and China Telecom networks are similar.
Thoughts/Suggestions
I talked to the DC Unlocker guys from the support and they advised me it might be from the Firmware. Even I've installed the international one and don't rule out that this might be the root issue of the issue as I don't know the origins of the International software.
Any suggestions?
Update 1: I got feedback from DC Unlocker Support that the phone is most likely "unlocked". Still I'm not convinced that both sim slots are unlocked.
Update 2: Another suggestion from DC Unlocker Support: If device support frequencies (EU) and if they are different from China (they might be) then, yes it should be possible to solve this with correct firmware if such exists. You should check first original specifications of device for china networks, then compare them to network that you want to use it with.
Update 3: Clarification that problem exists only for CL00 & TL00 models (and not the AL10 or L29) (thanks @jbmc83)

u have to add that this is only pertaining to the china telecom locked models CL00 & TL00, and not the AL10 or L29 models

I have AL10 and verizon sim wont work.
Sent from my HUAWEI NXT-AL10 using Tapatalk

is it only verizon or also other carriers?
edit: ah thats a different reason though. both al10 and l29 mate 8 versions are gsm and not cdma based. thats different from the cl00 and tl00 variants being carrier locked to specific network providers...
im betting ur al10 will work just fine with tmobile or att
Sent from my Huawei Mate 8 NXT-AL10 using Tapatalk

Flikera said:
Firstly let me apologize for duplicating the content of several other topics. This post will intend to summarize the issue in order to provide better visibility to anyone trying to help.
To start off, I have the same problem with my Mate 8.
The Issue
The Huawei Mate 8 has two Sim Card Slots: one supports 3g/4g and the other supports only 2g. That's how it's build.
When you pun in non-China Telecom card into *either* of the slots a message pops up saying that 3g/4g is only supported on China Telecom: https://tj6nvw-bn1306.files.1drv.com/y3p0MIG3qgLckpGbYHxgH70oReY058UmP2hfiLYG-HZPelszWa8XkA5gqwtKldaPY54l0lK91_XhjKz149GjRW6H06HJyAdEN7dXS8GzEWZyDvEiUeg7moZtmEGVG3nFj-qqywRCQTzYESnpN5IGyuD7w/Screenshot_2016-01-26-14-08-52%20%281%29.png?psid=1
More Details
It is possible to change the active 3g/4g card slot via settings configuration.
You can use 2g capabilities in *any* of the physical slots (via configuration above)
When you insert 2 sim cards only one of them is active. The device does *not* recognize the second card. It is possible to switch between the two cards, but only one of them can be active.
The problem is reported only for CL00 & TL00 models (and not the AL10 or L29 ones).
What is tried already?
I've tried and confirm all the items above.
Did factory reset.
I've loaded the International Software to Mate 8 from this topics
The Chinese Telecom message no longer appears on the International Software, however the slot still doesn't work.
Did factory reset on the international Software as well.
Tried to unlock it via DC-Unlocker - it is not possible. The "Unlock" button is grayed out.
The Sim Status in DC-Unlocker is "unlocked" however it shows only one IMEI number, where the phone has 2 IMEI numbers if you check it via *#06#
Guys report the same problem with Verizon cards, where Verizon and China Telecom networks are similar.
Thoughts/Suggestions
I talked to the DC Unlocker guys from the support and they advised me it might be from the Firmware. Even I've installed the international one and don't rule out that this might be the root issue of the issue as I don't know the origins of the International software.
Any suggestions?
Update 1: I got feedback from DC Unlocker Support that the phone is most likely "unlocked". Still I'm not convinced that both sim slots are unlocked.
Update 2: Another suggestion from DC Unlocker Support: If device support frequencies (EU) and if they are different from China (they might be) then, yes it should be possible to solve this with correct firmware if such exists. You should check first original specifications of device for china networks, then compare them to network that you want to use it with.
Update 3: Clarification that problem exists only for CL00 & TL00 models (and not the AL10 or L29) (thanks @jbmc83)
Click to expand...
Click to collapse
I can confirm it doesn't have this issue with the NXT-DL00 model on ATT it reads my sim just fine

wricu01 said:
I can confirm it doesn't have this issue with the NXT-DL00 model on ATT it reads my sim just fine
Click to expand...
Click to collapse
I have the DL00 version as well and I was wondering have you tried to load the international ROM or anything else on it. Does it work the same as the AL10

Who can lay oeminfo file from
dev / block / platform / hi_mci.0 / by-name /
of firmware for L29

jjerickson19 said:
I have the DL00 version as well and I was wondering have you tried to load the international ROM or anything else on it. Does it work the same as the AL10
Click to expand...
Click to collapse
Yes, I am currently with the international rom from the link in the original post. Still doesn't work.

off-line said:
Who can lay oeminfo file from
dev / block / platform / hi_mci.0 / by-name /
of firmware for L29
Click to expand...
Click to collapse
For CL00 user, it seems to me that the international(eu) "oeminfo" file is the key for flashing L29 firmware, described as this topic.
Does anyone put "oeminfo" file of L29 anywhere??

Even putting different roms on this phone doesn't change the fact the main aim is locked in CDMA / LTE mode. It's a hardware thing or something these different roms can't edit.

same problem

1st slot 4g 3g 2g snd slot 3g/2g on each mate 8 any version

AT&T Note 8 on T-Mobile

Upgraded to Note 9, want to pass my Note 8 on to a T-Mobile user. I want a complete T-Mobile experience, so all T-Mobile bloat and settings are needed (VoLTE, Hotspot, etc...) . Note 8 currently has latest CRID OTA from ATT. Looking for help in determining the correct way to proceed. I am having AT&T carrier unlock the device, so I would make this change after confirmed unlock. Also, once this is finished, will the device receive T-Mobile OTA updates?
I have read through https://forum.xda-developers.com/galaxy-note-8/how-to/guide-sm-n950u-u1-t3685884 but am confused. I see lots of mention of combination files, CSC changing, etc... that seem overkill for what i'm looking for.
Are these the steps I need to take?
1) Download latest Odin compatible TMB Firmware (which is what version?)
2) Download Odin on PC
3) Factory reset Note 8
4) Flash TMB firmware
5) Insert TMB SIM card
6) Success?

Yes just download this file
https://www.sammobile.com/firmwares/galaxy-note8/SM-N950U/TMB/download/N950USQU5CRIA/237765/
Flash everything with Odin and you will have a full 100% T-Mobile Note8 with all carrier features working
Sent from my SM-N950U1 using Tapatalk

Vish.N said:
Yes just download this file
https://www.sammobile.com/firmwares/galaxy-note8/SM-N950U/TMB/download/N950USQU5CRIA/237765/
Flash everything with Odin and you will have a full 100% T-Mobile Note8 with all carrier features working
Sent from my SM-N950U1 using Tapatalk
Click to expand...
Click to collapse
I saw here that simply flashing a different carrier firmware will not actually change carriers?? Is that correct?
https://forum.xda-developers.com/showpost.php?p=74087669&postcount=3
Someone in that thread said I would need to flash an unlocked U1 firmware and then the TMB firmware?

I am about to do this as well, switching from AT&T to T Mobile using my AT&T branded Note 8. I just wanted to confirm that it's as simple as downloading the latest Android Pie firmware for T Mobile and flash it to the AT&T branded phone? Any precaution like some other thread mentioned to flash the U1 (unlocked) firmware first then flash the T Mobile firmware?
Also, eventually, I will be giving this Note 8 to someone in China. At that point, is it better to flash the unlocked version of firmware or just leave the T Mobile firmware on it?
Thanks so much for your help.
Note: the phone is already unlocked.

I just wanted to let everyone know that I went and got T Mobile. After the new SIM card was inserted in my AT&T Note 8, after a reboot, it did something, a screen with a SIM car graphics and some moving dot. Then it rebooted itself again, and then T Mobile splash screen showed up. It even added the bloatware from T Mobile. So, Android 9 for Note 8 probably has both ROMs? I also checked the firmware version. It shows the latest T Mobile ROM.
I didn't have to do anything other than just inserting the new SIM card from T Mobile.
This is very interesting to me, and the store guy couldn't believe his eyes either.

de2000 said:
I just wanted to let everyone know that I went and got T Mobile. After the new SIM card was inserted in my AT&T Note 8, after a reboot, it did something, a screen with a SIM car graphics and some moving dot. Then it rebooted itself again, and then T Mobile splash screen showed up. It even added the bloatware from T Mobile. So, Android 9 for Note 8 probably has both ROMs? I also checked the firmware version. It shows the latest T Mobile ROM.
I didn't have to do anything other than just inserting the new SIM card from T Mobile.
This is very interesting to me, and the store guy couldn't believe his eyes either.
Click to expand...
Click to collapse
And i was wondering why my phone still showing at&t bloatware even after installing the Verizon firmware. ? Now i understand Cuz I'm using at&t sim. Good to know?

Another update!
I just got updated by T-Mobile to the latest firmware after converting over as previously stated. I have to say that the update page on the phone for the T-Mobile firmware is MUCH nicer and informative than the ATT version. It tells you how much time left, the version numbers, and even a "what's new" section...
After this update, my phone is actually better at battery usage.

Does T-Mobile OP8 5G Support Dual-Sim if on Global Firmware?

I was curious as a colleuge of mine recently purchased the OP8 5G from T-Mobile rather than directly from OnePlus. The sim tray only supports one SIM, and I am assuming that as it has been done historically on prior OP devices, the T-Mobile OP software only supports one sim card. I am unsure as to whether the T-Mobile variant has hardware to support two sims or not, but I think it may only a software issue. Would rooting and flashing to get onto the Global firmware enable dual-sim support for a OP8 5G T-Mobile variant?
Thank you,

I'd assume so. I'm planning on trying this myself when my dual sim slot comes in from Shenzhen.

tri_cchan said:
I'd assume so. I'm planning on trying this myself when my dual sim slot comes in from Shenzhen.
Click to expand...
Click to collapse
What is the dual sim's use case for you? International travel or work/personal use?
I think in Asian countries, people often get 1 cheap SIM for cheap voice plan and another SIM for cheap data plan.

iKevin said:
What is the dual sim's use case for you? International travel or work/personal use?
I think in Asian countries, people often get 1 cheap SIM for cheap voice plan and another SIM for cheap data plan.
Click to expand...
Click to collapse
In my colleague's case, for work and personal use. I personally have my OP7 Pro as my work phone, and it is the unlocked non-carrier variant, so the dual sim support is there. However, for my use, too, I would like to have the capability available on my T-Mobile OP8 5G just as my colleague. I had him order a dual-sim tray from eBay, and from a US seller to get the item faster. If it works for him, I'll likely order the dual sim tray.

i dont think the global or eu roms support dual sim. there was a disclaimer under the network & sim settings untill ob1. not sure if ob1 supports dual sim yet

Dual sim works, however, i cant get my Verizon sim to work with t-mobile. I get the CDMA-less notification, i read that you can get it to work, you just got to call verizon to register your imei with them so dual sim can work. This is running open beta, stable 10.5.12 wouldnt see my second sim.
I havent called them because my verizon sim is through work.

esjames said:
Dual sim works, however, i cant get my Verizon sim to work with t-mobile. I get the CDMA-less notification, i read that you can get it to work, you just got to call verizon to register your imei with them so dual sim can work. This is running open beta, stable 10.5.12 wouldnt see my second sim.
I havent called them because my verizon sim is through work.
Click to expand...
Click to collapse
And, this is on a T-Mobile OP8 5G? If so, I wonder if my colleague would have any issues running two T-Mobile SIMs on a global ROM? (I suspect the T-Mobile software doesn't even recognize a second SIM).

SimranSingh said:
And, this is on a T-Mobile OP8 5G? If so, I wonder if my colleague would have any issues running two T-Mobile SIMs on a global ROM? (I suspect the T-Mobile software doesn't even recognize a second SIM).
Click to expand...
Click to collapse
Yes, this is on my t-mobile OP8. I converted to global because I prefer global. I haven't tried two t mobile sim cards, and I haven't tried using t mobiles firmware.

esjames said:
Yes, this is on my t-mobile OP8. I converted to global because I prefer global. I haven't tried two t mobile sim cards, and I haven't tried using t mobiles firmware.
Click to expand...
Click to collapse
So, after receiving the dual sim tray, and inserting two SIM's on T-Mobile's software--it does not even recognize the second SIM. What particular guide did you use to port over to the global firmware? Thanks!

I would also be really interested in knowing how to get the second SIM to read on the T-Mobile IN2017 variant of this phone. I've been tearing my hair out trying to get this to work, now that I've seen that the international models running Android 11 OB2 seem to have functional dual SIM. Personally, I kind of gave up on getting Android 10 to do dual SIM- even with the European ROM (which I'm fairly certain is the only way dual SIM on this device was ever officially supported by OnePlus), I haven't gotten it, but I think I'm annoyingly close. T-Mobile MSM to Global 10.5.12 to Android 11 DP2 will get you non-functional dual SIM- the device will see both SIM cards, and will properly identify them and their phone numbers, but the second SIM won't connect to voice or data, no matter what I do. If I upgrade the device from DP2 to OB2, the dual SIM UI stays (if I go directly from Global to OB2, it doesn't show), but the second SIM slot is still non-functional- no service for voice or data on the second SIM.
For anyone who has gotten a T-Mobile OP8 to properly read two SIM cards, I'd really like to know how- through my hours of messing around with this thing, it always seems like one step forward and two steps back. Hopefully the final release of Android 11 clears this up.
(My two SIMs are from T-Mobile and AT&T, respectively. Unfortunately, I don't think two T-Mobile SIMs has a chance of ever working with this setup on any firmware- "SIM 1" and "SIM 2" share an IMEI. While that's probably okay for SIMs from different carriers, that's not going to fly on the same carrier- it will look like a cloned IMEI to the network, and probably get shut down fairly quickly.)

Has anyone managed to make it work the Oneplus 8 (pro) unlocked USA version with 2 sims at the same time ? Thank you

It's working on mine with second simbtray however there is no service with both inserted. BecUzebitvhas the same IMEI as slot 1

esjames said:
Yes, this is on my t-mobile OP8. I converted to global because I prefer global. I haven't tried two t mobile sim cards, and I haven't tried using t mobiles firmware.
Click to expand...
Click to collapse
I did the same thing to mine but I'm just seeing one imie active and usually it's 2

angelosabatini said:
Has anyone managed to make it work the Oneplus 8 (pro) unlocked USA version with 2 sims at the same time ? Thank you
Click to expand...
Click to collapse
I'd also like to know

Yes I have successfully convert my T-Mobile OnePlus 8 to global ROM and now I have dual sim compatibility.

haseebali55554 said:
Yes I have successfully convert my T-Mobile OnePlus 8 to global ROM and now I have dual sim compatibility.
Click to expand...
Click to collapse
Did you try using 2 sim cards ? Both working fine ? If yes, please share the guide with us. Thanks.

dedsecdz said:
Did you try using 2 sim cards ? Both working fine ? If yes, please share the guide with us. Thanks.
Click to expand...
Click to collapse
1. First of all unlock bootloader and u also have permanent sim unlock from t-mobile.
2.After unlocking your phone will restart, setup your oneplus 8 and enable developer mode and in developer mode enable "usb debugging" .
Note: You must have working adb/fastboot drivers.
3. now restart your phone to bootloader.
4. Download any android 10 fastboot Rom from xda developer.
"I have tested this : https://sourceforge.net/projects/fastbootroms/files/OnePlus 8/10.5.9-EUROPE-OnePlus8Oxygen_15.E.18_OTA_018_all_2007160043_913306-FASTBOOT.zip/download
4.1. For flashing this rom your phone has to be in fastboot mode.
5. After downloading extract the rom and open extracted folder and double click "flah_all.bat
5.1.connect your phone to computer in fastboot mode and enter "Y"
wait for 5 to 7 minutes, in this process your oneplus will restart to recovery mode but never unplug the cable or use your phone during installation.
Note: i have tested dual sim with dual sim tray.

haseebali55554 said:
1. First of all unlock bootloader and u also have permanent sim unlock from t-mobile.
2.After unlocking your phone will restart, setup your oneplus 8 and enable developer mode and in developer mode enable "usb debugging" .
Note: You must have working adb/fastboot drivers.
3. now restart your phone to bootloader.
4. Download any android 10 fastboot Rom from xda developer.
"I have tested this : https://sourceforge.net/projects/fastbootroms/files/OnePlus 8/10.5.9-EUROPE-OnePlus8Oxygen_15.E.18_OTA_018_all_2007160043_913306-FASTBOOT.zip/download
4.1. For flashing this rom your phone has to be in fastboot mode.
5. After downloading extract the rom and open extracted folder and double click "flah_all.bat
5.1.connect your phone to computer in fastboot mode and enter "Y"
wait for 5 to 7 minutes, in this process your oneplus will restart to recovery mode but never unplug the cable or use your phone during installation.
Note: i have tested dual sim with dual sim tray.
Click to expand...
Click to collapse
we dont need to root ?
we dont need to back up modem and persist as well?

aviator.OO7 said:
we dont need to root ?
we dont need to back up modem and persist as well?
Click to expand...
Click to collapse
I haven't face any fingerprint or network signals problem after converting.

haseebali55554 said:
I haven't face any fingerprint or network signals problem after converting.
Click to expand...
Click to collapse
do i need to root to begin with ?

Visible SIM not recognized in rooted OP7 Pro unlocked

I checked my IMEI on Visible's website and it checked out. I am running the Android 11 Pixel Experience ROM and Google Fi SIM worked fine, but I cannot get the Visible SIM to even be recognized as existing in the tray. I tried both SIM slots. Does this have something to do with being rooted? Ironically I installed this SIM in my Poco F3 which is NOT compatible, and although I got no service, that phone did recognize the SIM and even all of the Verizon APNs. Just wondering if you guys have any thoughts? Thanks.

tuffluck said:
I checked my IMEI on Visible's website and it checked out. I am running the Android 11 Pixel Experience ROM and Google Fi SIM worked fine, but I cannot get the Visible SIM to even be recognized as existing in the tray. I tried both SIM slots. Does this have something to do with being rooted? Ironically I installed this SIM in my Poco F3 which is NOT compatible, and although I got no service, that phone did recognize the SIM and even all of the Verizon APNs. Just wondering if you guys have any thoughts? Thanks.
Click to expand...
Click to collapse
It shouldnt have anything to do with being rooted, but if you have converted/changed firmware then that could be the issue.

If you have the engineering mode app installed u can check the sim in *#808# or by adb shell am start com.oneplus.factorymode/.manualtest.SimCardTest . If the test fails then the modem or your efs is messed up.Hopfully you have a efs back up. Try starting over with MSM flash first.I believe the fail sim is caused buy a key that is in the locked sfs folder of the efs. I do know for a fact there is a RSUprivate key there also. And have obtained it. But still have not found a way to write this back, other then efs restore in twrp.

I'm guessing it is related to the ROM.

tuffluck said:
I checked my IMEI on Visible's website and it checked out. I am running the Android 11 Pixel Experience ROM and Google Fi SIM worked fine, but I cannot get the Visible SIM to even be recognized as existing in the tray. I tried both SIM slots. Does this have something to do with being rooted? Ironically I installed this SIM in my Poco F3 which is NOT compatible, and although I got no service, that phone did recognize the SIM and even all of the Verizon APNs. Just wondering if you guys have any thoughts? Thanks.
Click to expand...
Click to collapse
I'm on visible and I'm using an unlocked T-Mobile gm1915. When on the global rom, it gave me a pop up to instructions for using the verizon sim on a cdma-less device. However, I didn't have to do anything and the sim started randomly working after waiting 5-10 minutes. So, i recommend just leaving the sim in for atleast 10 min and have mobile data on.

Question AT&T Z Flip 4 Flashed T-Mobile Firmware But Boot Animation Still AT&T

Wondering if I flashed correctly because the boot animation is still AT&T. I used Odin to flash the latest firmware (F721USQU1AVIA_F721UOYN1AVIA_TMB). Shouldn't the AT&T apps go away and the T-Mobile apps get installed? Bought phone and the seller didn't say it was the AT&T version but instead said it was Samsung unlocked. Anyway, since I'm on T-Mobile I figured there must be a way to put the T-Mobile firmware on the phone. Is that not the case?
Any tips would be appreciated.
Thanks.

First the AT&T apps only appear if you have flashed the firmware and booted up the device with an AT&T sim card inside the phone. Second, if you want to get the T-Mobile variant of the firmware, take out the sim card with your device powered on, reboot your phone, unlock your devide, then insert your T-Mobile SIM card, you should see a pop up saying something, like "restart your device to get carrier features" an on that same pop there should be a button saying "restart" or "ok" or something along the lines of those.

Hmmm I'll try that. The phone had the T-Mobile sim in it when flashed. Should I have not had a sim in at all during the flash?
Thanks

I don't think it really matters if the sim card is out during the flash because I'm pretty sure when you the sim card back in after the device restarts and you then put the card back in you will still need to restart the device to get the carrier software installed.

I wonder if this only applies to Samsung unlocked versions and not the carrier unlocked version because I received no such prompting when the sim was inserted (originally an AT&T sim was in the phone, then I put in my T-Mobile sim).

Did you buy the phone unlocked? You should use the patched version of Odin which can be found [here](https://forum.xda-developers.com/t/patched-odin-3-13-1.3762572/) and download the file labeled 3.14.1_3B_patched. this patched version ignores and bypasses the following conditions
"FAIL! Model mismatch fail" (all PatcheD versions)
"FAIL! SHA256 is invalid" (all PatcheD versions)
"FAIL! Blocked carrier" (PatcheD versions >= 3.14.1)
You can also use the patched Odin to go from carrier firmware to unlocked firmware (which is what I use it for since AT&T takes forever to push updates out)