• Introducing XDA Computing: Discussion zones for Hardware, Software, and more!    Check it out!

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

Search This thread

aviator.OO7

Member
Oct 4, 2015
48
3
Brother i think just flash the EU rom without root, if after converting you face any signal or fingerprint issue just re-flash the T-mobile rom with MSM tool.Root is mandatory for backup of presists and modem images.
can you link the oneplus drivers you used?
i am on tmo android 11 build no 11.0.4.6 IN55cb ... can i use this method or should i down grade with msm tool first
 

aviator.OO7

Member
Oct 4, 2015
48
3
I used this for Qualcomm drivers.
and if u have Tmo android 10 rom so please flash it before conversion
sorry to bother you with a lot of questions ..can you link the tmo msm as well for oneplus 8? im not sure which version to use its my first time doing such stuff
 

haseebali55554

Senior Member
Oct 22, 2015
58
6
islamabad
OnePlus 8
sorry to bother you with a lot of questions ..can you link the tmo msm as well for oneplus 8? im not sure which version to use its my first time doing such stuff
I have used this Tmo msm tool android 10 rom.
Just if u don't know msm tool roms are flashed in edl mode.
(Turn off your oneplus and click power up and down buttons and insert usb c cable which is already atteched to pc )
My english is very bad, so please adjust
 
Last edited:

phidung3721

Senior Member
Nov 5, 2011
189
64
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.
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
 

aviator.OO7

Member
Oct 4, 2015
48
3
Last edited:

haseebali55554

Senior Member
Oct 22, 2015
58
6
islamabad
OnePlus 8
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
 

Attachments

  • Screenshot_20210926-182341.jpg
    Screenshot_20210926-182341.jpg
    462.2 KB · Views: 36
Last edited:
  • Like
Reactions: phidung3721

acostmisa

Member
Apr 7, 2016
26
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
 

haseebali55554

Senior Member
Oct 22, 2015
58
6
islamabad
OnePlus 8

phidung3721

Senior Member
Nov 5, 2011
189
64
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
Thank you. My phone shows dual sims now. I'm still waiting for my dual sim tray to arrive before I can test it out. I think relocking bootloader is the key to get dual sim.
 

Top Liked Posts

  • There are no posts matching your filters.
  • 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
    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