@Bryn2
Try resetting your network settings, if not, you'll need a new blank sim from O2 and then do a sim swap Guide: Sim Swap: a mini guide 2017 update
May not fix the delivery report issue though as iOS16 always throws that error message with O2.
You need to precede your texts with *0# to get an accurate status.
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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