Why is my iPhone showing the wrong number?
In Settings, under phone, it's showing a random phone number.
What's going on?
iPhone SE, iOS 13
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Try This
Sign out of Apple ID in iCloud, iMessage, and FaceTime.
Turn off iMessage and FaceTime.
For GSM phones, remove your SIM card and reinsert it. (Use a safety pin or paperclip to open the SIM tray)
Reset the network settibgs. (General > Reset > Reset Network Settings)
Turn on iMessage and FaceTime.