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

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SimranSingh

Senior Member
Nov 21, 2010
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SimranDev.com
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,
 

iKevin

Member
Mar 11, 2007
49
3
I'd assume so. I'm planning on trying this myself when my dual sim slot comes in from Shenzhen.
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.
 

SimranSingh

Senior Member
Nov 21, 2010
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SimranDev.com
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.

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.
 

42o247

Senior Member
Nov 10, 2010
549
63
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
 

esjames

Senior Member
Nov 8, 2013
398
105
Cheriton
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.
 
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SimranSingh

Senior Member
Nov 21, 2010
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SimranDev.com
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.

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).
 

esjames

Senior Member
Nov 8, 2013
398
105
Cheriton
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).

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.
 

SimranSingh

Senior Member
Nov 21, 2010
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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.

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!
 

bigleague4040

Member
Dec 1, 2010
33
1
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.)
 
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angelosabatini

Senior Member
Oct 3, 2009
91
11
Has anyone managed to make it work the Oneplus 8 (pro) unlocked USA version with 2 sims at the same time ? Thank you
 

bluemoel

Member
May 15, 2015
23
6
It's working on mine with second simbtray however there is no service with both inserted. BecUzebitvhas the same IMEI as slot 1
 

haseebali55554

Senior Member
Oct 22, 2015
58
6
islamabad
OnePlus 8
Yes I have successfully convert my T-Mobile OnePlus 8 to global ROM and now I have dual sim compatibility.
 

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haseebali55554

Senior Member
Oct 22, 2015
58
6
islamabad
OnePlus 8
Did you try using 2 sim cards ? Both working fine ? If yes, please share the guide with us. Thanks.
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.
 

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aviator.OO7

Member
Oct 4, 2015
48
3
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.
we dont need to root ?
we dont need to back up modem and persist as well?
 

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  • 1
    Did you try using 2 sim cards ? Both working fine ? If yes, please share the guide with us. Thanks.
    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.
    1
    That's so weird. I flashed the same version if EU ROM but didn't get dual SIMs. Do you remember which version if TMO ROM before flashing EU.10.5.9?
    Thanks
    Brother after flashing eu10.5.9 just update your OnePlus to latest 11.0.8.8 (because dual sim compatibility is only available in android 11/oxygen 11) and then lock the bootloader after locking your phone will rest and u will see dual sim compatibility after setup.
    Maybe looks wired but works for me
    1
    Our government block unpaid IMEI numbers so we change IMEI number of our phone with paid one
    Haseeb I'm from pakistan can i have you number, email or any kind of contact so I can contact you directly. Please 🙏 🥺