@Cotonou
Known issue on iPhones as there was a change to iOS15 that meant it couldn't read the way O2 diagnses delivery reports.
If you start all your sms messages with *0# you will get a delivery report from O2 and you just need to ignore what the phone says.
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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