O2

How can I lengthen the number of rings before the answerphone kicks in I followed 'To activate= **61*901*11* number of seconds # and I get 'Error performing requestUnknown Error Setting Registration FailedVoice Call ForwardWhen Unanswered' Thank you ...

If I purchase extra data and I don’t use it all, how many times will it roll over?

We have a friend visiting from Thailand for 15 days. They want to use their iphone for data. Do O2 offer any SIM cards?