phone says phone number unknown

Just done a SIM SWAP and all OK except now my Galaxy s2 now says phone number unknown - how do I get it to recognise new sim?

John

SIM Swap can take several hours to complete

Try restarting your handset periodically

@johnmogridge

You reboot it. It sounds as if the handset is stuck in mid process and needs to sign in again

@johnmogridge sim swap takes a while to work is your phone been on 02 or unlocked.