Unable to receive texts after sim swap

[TraceyM]

I just upgraded to the Samsung Galaxy S20 5G. I did the sim swap yesterday as previously had a 4G phone. I can now make and receive calls and send text messages but I am unable to receive any texts. Its been over 24 hours since the sim swap. My old sim card no longer detects a network. I cannot get through to O2 to ask for help. I've checked my message centre number is correct and even tried connecting to another network. I've also turned the phone on and off again multiple times. Nothing seems to be working Does anyone have any ideas?

[Maad]

My issue was resolved after speaking to live chat.

Seems to be linked to iMessage activation also.

Signed out of iCloud completely, iMessage and Facetime too. Rebooted my phone and waited another 24hrs. After this time, the SMS's started popping in, then after some hours more, iMessage activated successfully