Thanks Sparkrite!
bUT I HAVE TRIED ALL THAT. PROBLEM IS, IT WONT LET ME CHANGE THE MESSAGE CENT NUMBER WHICH CURRENTLY HAS THE NUMBER 1 IN IT ONLY. WHEN I TRY CHANGE IT TO THE o2 NUMBER, IT KEEPS SAYING 'INVALID PROCEDURE' AND ERROR READING FROM sIM CARD.
Sorry for capitals, only just read it back now! lol