Suddenly out of the blue I started having problems with receiving some text. Mostly it affects verification codes sent as a part of 2 step authentication - most of the time I don't get them all, sometimes they come a few hours later. I also had a few other texts that I was meant to receive but didn't, or they came late (things like booking confirmations or delivery update from the Royal Mail).
This is really annoying me, and it means I might get locked out of my online banking, work email, and many other important things that use 2 step authentication.
I'll add that I've been with the O2 for more than 10 years on Pay Monthly, use an iPhone XR (had it for almost 2 years). My software is up to date (updated recently) but the problem started before the last update. I tried things like restarting the phone, resetting network settings etc. - it didn't help. I checked network coverage in my area, all okay.
