I noticed this morning that I can't receive or make phone calls or send/receive text messages. My phone (nokia 5800 on PAYG) is showing full signal but when someone tried to phone me this mornig they got the message "you've dialled an incorrect number". I've also tried to phone my mobile but it doesn't ring.

I've tried to make calls but that's not working either!
I've tried to phone Vodafone's customer services but when you get through after pressing various numbers it tells you that they are experiencing problems and to phone back later.
Is anyone else on Vodafone PAYG having problems today??