My SIM card has stopped working in my phone twice. First time was during the massive outage, it just never reconnected. I got a new SIM from Currys and it fixed. Last week it happened again so I've got another SIM from Currys and all is fine for now.
Both times the SIM would work in my spare phone but not in my main phone and both times another SIM works in my main phone. I've fixed the problem but would like to know what might be happening, it is scary and a big hassle with no phone.