Sim card unknown number

Hey there @DMDart83!

Since your other services (cellular and text messages) appear to be functioning properly a new SIM card is not likely, though not out of the realm of possibility.

One reason you may be viewing a different number under Settings is if service with your previous provider was inactive prior to bringing your device over to AT&T. Generally, a transfer of service provider requires active service on the device.

There's also the possibility that the number belonged to an eSIM which is fully capable on the Samsung Galaxy S20 5g, but, currently, not supported on AT&T Samsung phones. Here are the only devices supporting eSIM.

As it relates to Wi-Fi Calling on your Samsung Galaxy S20, make sure that you have an eligible AT&T PREPAID plan as Pay Per Use/Minute Plans do not include Wi-Fi calling. Additionally, it won't help to check Settings then Connections for a switch to enable Wi-Fi Calling.

Lar, AT&T Community Specialist

It doesn't have a different number, its saying unknown number.  Also would I need a different sim card for my wifi calling?

Hello @DMDart83,

If you have not already tried this, please contact PREPAID at 800.901.9878 or +1.408.962.1025 (free call from your prepaid phone).

If you ever have any other questions or concerns in the future, feel free to reach back out as we are always here to help!

Jonye, AT&T Community Specialist