Issues using the phone when red triangle is present

Can’t send or receive calls, text mssg’s, access music or other data within phone (apart from internet access), red triangle on screen

There should be a notification in the notification shade associated with that red triangle. What do you see when you swipe downward from the top-center of the screen to open the notification shade.

If this is the red triangle with the exclamation mark and the android symbol you might try an external factory reset.

Factory Reset

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