@Damien1
You can try asking in store but there are no guru's anymore. They were removed some time ago.
Try these tips Guide: Text Message Tips (not sent or received)
Another possible fix is to try different messaging apps off Play store.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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