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[CODES] Documented secret codes for OnePlus 5T

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Randname

New member
Nov 5, 2020
1
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There was a thread noticing all the codes but they are not documented so this might be useful.
Disclaimer: I am neither resposible to accuracy of description of these codes nor any damage/loss caused by using codes improperly/recklessly.
Notice: Codes here are based on H2OS (which is the stock ROM in China rather than OxygenOS), so some of the codes may not be available in OxygenOS.

  • Language
    *#008# : Change system language to zh-CN immediately.
    *#67760044# : Change system language to en-US immediately.

  • Diagnostic
    *#10000# : Show diagnostic results. If you have never cleared them manually or messed with diagnostic menu or functions before, this is your in-factory test result, which should be all OK.
    *#800# : System logging menu.
    *#808# :Don't operate functions recklessly in this menu. Diagnostic mode main menu.
    *#802# : GPS test.
    *#803# : Wi-Fi test.
    *#804# : Mobile network searching test.
    *#805# : Bluetooth test.
    *#806# : Don't use this code recklessly since it would take long and may cause other issues if being stopped forcefully. Burn-in quality test.
    *#807# : Auto test, which tests lot of things one by one.
    *#809# : Microphone Loopback test.
    *#814# : TD-SCDMA network searching test.
    *#824# : WCDMA network searching test.
    *#834# : LTE network searching test.
    *#900# : Rear camera test.

  • Information
    *#1234# : Show a dialog box about SoftwareVersion.
    *#66# : Show IMEI and encrypted IMEI.
    *#6776# : Show more about software version compared to 1234 code.
    *#888# : Show motherboard PCB ID and it's QR code.
    *##*37847# : Show hardware components' model and suppliers.

  • Engineering
    *#36446337# : Don't operate functions recklessly in this menu. Engineering mode main menu.
    *#268# : Don't use this code recklessly as it may damage baseband. NV param testing and calibration.
    *#801# : Switches for enginners.
    *##*8110# : OTA test mode switch. This switch could probably be used for blocking OTAs.

  • Others
    *#8778# : Factory reset. You will lose all your data.
    *#911# : You may lose all your data. This would send you back to first-time setup page after reboot.
    *#99# : Screen always on. Enter the code again to disable.

  • Easter Egg
    Not sure if ever presented in OxygenOS.
    Game Space - Options - Fnatic Mode - Click the Fnatic icon repetitively - Type "alwaysfnatic" in the textbox poped up - New hidden wallpapers !
 
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