Don't keep you screen on all the time it will eat your battery up to a extent. keep in mind depending on the screen type you will experience screen burnIN than your not going to be a happy camper. You can have the screen timeout less often and stay on longer but I would not have it on all the time. it can also over heat the phone. Treat it like a human we need to close are eye so thay don't start to hurt.
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There two types of IMEI numbers there's the regular IMEI number than IMEI eSIM, make sure your using the regular one. if that doesn't work try the eSIM, if that doesn't work either that means your phone is not unlocked if I'm correct don't quote me on that though.
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Do you have chat feature enabled in the messaging app? a coworker was haveing the same problem, if you have it enabled and thay don't it get baggy sometimes.
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