: When you move a phone number from an old carrier to a new one, the new SIM card often retains the temporary number it was originally assigned or remains blank.
Finding "Unknown" in your Android phone's identity settings is a common occurrence that rarely affects your actual ability to make calls or send texts. This label typically appears because your mobile carrier has not written the specific phone number onto the metadata of your SIM card. Why Your Phone Number Shows as "Unknown"
The "About Phone" or "SIM Status" section in your settings reads a specific property on your SIM card. If this property is empty, Android defaults to displaying "Unknown".
While the status itself is harmless, you can often manually force the number to appear using these methods: Why is my phone number shown as unknown in settings?
: Modern carriers, especially those using eSIMs, frequently leave this field blank as it is technically optional for network functionality.