How do I fix my iPhone not receiving texts?

The SMSC number is the identifier assigned to a mobile phone. It's the number that is used to send and receive SMS messages. If it's blocked, you can try unblocking it. In this way, your iPhone will not be able to receive texts. Hence, you'll need to remove it from your iPhone. In some cases, this problem may be related to software.

See also - https://emailspedia.com/iphone-is-not-sending-texts-to-android/