Нашёл 11 млн ответов for 'My mobile phone number'.
https://www.digitaltrends.com/mobile/how-to-look-up-your-phone-number-in-android-and-ios/
https://mobile.asda.com/scoop/mobile-number-from-sim
https://mobile.asda.com/help/getting-started/find-my-number
https://www.phone-location.info/Phone-Number-Lookup
https://www.phone-location.info/find-my-android
https://www.phone-location.info/mobile-number-locator
https://www.wikihow.com/Find-Your-Phone-Number-on-Android
https://www.wikihow.com/Get-Your-Mobile-Number-from-Your-SIM
https://www.wikihow.com/Get-Info-About-a-Phone-Number-Free
https://www.technipages.com/android-find-phone-number