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I have an unlocked Oneplus 7 Pro that I just installed Havoc OS on, which stopped the SIM card from being recognized. This SIM card works on both other phones (stock Pixel 2) and this phone with a stock ROM. The phone still has its two IMEI numbers. I've looked at quite a few options to fix this, such as:

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  • You phone has a dual-SIM slot. Are you sure your ROM supports both SIM slots? May be the ROM only support one of the slots and currently your SIM is seated in the wrong slot?
    – Robert
    Commented Oct 11, 2020 at 16:50
  • @Robert That could be the case, but the phone only came with a tray for one SIM, which I assumed to be the primary one. I also just checked the two IMEIs again, and they both seem to be the same as the one printed onto the back of the phone.
    – Jeffmagma
    Commented Oct 11, 2020 at 17:40

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