Many pay-as-you-go SIM chips leave this data blank by default. How to Fix the "Unknown" Status
This is the first place to check. The menu names vary slightly depending on your phone manufacturer (Samsung, Google Pixel, OnePlus, Xiaomi, etc.). how to check your phone number on android
Go to Settings ➔ System ➔ System Update to check for carrier configuration updates. To help find your number, let me know: What brand of Android phone do you use? Who is your cellular service provider ? Are you using a physical SIM or an eSIM ? Many pay-as-you-go SIM chips leave this data blank
If your phone will not turn on or the software methods fail, you can check the physical SIM card. how to check your phone number on android