Mmmm, the ridiculous of life where there's no apparent sense to IT?
9 old too late to be of much use, txts arrived this afternoon, in a batch. The originating txts were sent at different times over a span of 3 days.
Turned off the iPhone 13, removed the SIM card, with difficulty - it requires more force with the straightened paper clip than seems sensible. Bunged SIM back in and turned phone on again.
Used the iMac to log on to the credit card website, which then required a txt generated passcode. This was using Wi-Fi Calling and Airplane mode to save battery usage, as no mobile reception at home. BOOF! Almost instant receipt of txt again restored?
No idea where the decidely worrying and problematic heebie jeebies were occurring, or why