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

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haseebali55554

Senior Member
Oct 22, 2015
64
11
islamabad
LG V40

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acostmisa

Member
Apr 7, 2016
27
3
I have followed all the steps and I even changed the imei and the sim2 still does not get signal. i have installed, India, EU and Global rom and nothing
 

acostmisa

Member
Apr 7, 2016
27
3
As you can see it recognize the sim2 but not get signal
Screenshot_20210929-090731.jpg
 

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VovaKhari

New member
Feb 8, 2022
4
1
The phone sees two SIM cards, but the second does not destroy the signal.
There is a person who understands the system partition, I, that there is such a memory section that is responsible for the operation of the baseband for two SIM cards, but on the tmobile version it is blocked, you need to edit this section and both SIM cards will work.
 

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  • 1
    Yes I have successfully convert my T-Mobile OnePlus 8 to global ROM and now I have dual sim compatibility.
    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
    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

    Hi man, can you make calls on both sims?, im on Global 11.0.8.8 and i can see both sims but just the sim1 is working the sim2 doesn't work
    1
    Yes I have successfully convert my T-Mobile OnePlus 8 to global ROM and now I have dual sim compatibility.
    Aoa, did you get both of your IMEIs changed? By default they patch only 1st IMEI but seems like you got your 2nd one patched as well after converting the phone?