OnePlus 6T Guide - How to Enable Dual-SIM & Remove T-Mobile Bloat!

toomuchdogfur on 16/07/2020 - 13:52
Last edited 21/07/2020 - 17:51

IMPORTANT: I have found out that doing this causes the phone to fail SafetyNet. This means that NFC payment services (Google Pay) and some other sensitive applications may refuse to function. Please proceed with caution.

I recently got a OnePlus 6T from the recent Dick Smith deal, and was disappointed (but not suprised) to find it was T-Mobile branded and lacking its usual Dual-SIM capabilities.

Turns out, its pretty straightforward to fix both of those issues!

  • Follow this guide on XDA-Developers to flash your 6T to stock OxygenOS 9.0.11
  • You might find your OTA updates fail after this point. Download Oxygen Updater which will download the latest OxygenOS 9 update, which is required before updating to OS 10 (for some reason the stock OTA updater can't figure this out)
  • After the above, try the stock OTA updater again and it should get you on the latest OxygenOS 10 version!

Now you will have clean, international OxygenOS ROM and should see the Dual-SIM hardware online. However the jerks at T-Mobile also put in a custom SIM tray that omits the cutout needed for SIM2, so you will need to either modify the tray or buy another one from eBay.

Mobile Mobile Phone OnePlus Android

Comments

  • scotty on 16/07/2020 - 14:20
    +1

    so you will need to either modify the tray or buy another one from eBay

    Can't imagine how expensive the SIM tray costs on eBay.

    • toomuchdogfur on 16/07/2020 - 15:59

      Yeah, I couldn't find anything cheaper than ~$15, and nothing local either.

      I tried to test the SIM2 slot by partially inserting the SIM tray (hence putting SIM1 at the SIM2 position) but the phone won't recognise it - there's a few copper contacts on the end of the SIM tray, so I suspect the SIM slots aren't activated until the tray is fully inserted. There are reports in Amazon reviews and OnePlus forums that you do indeed get true Dual-SIM functionality once you can get the right tray though.

      • Clear on 16/07/2020 - 20:14

        AliExpress will set you back around $3.80. Though you'd probably be better off getting one from a seller with better shipping even if it costs.

  • Mungnang on 16/07/2020 - 15:28
    +1

    They did not actually mention that it was from T-mobile… Sounds like a hassle but glad you got to sort it out!

    • toomuchdogfur on 16/07/2020 - 15:52

      Yeah they kinda sorta weasel-word it at the bottom of the listing:

      This product is brand-new, ex-carrier stock. A Wi-Fi connection is required before the phone can be SIM-ready.

  • mangoice on 21/07/2020 - 08:53

    Thanks

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