It says i have bars, but i can't call, top up or text, all it keeps saying is error performing request, unkown request. what is wrong and what do i do

like it says in the title, I have a 3GS and i'm with O2, it is saying I have service/bars most of the time full bars, but when I go to text, call or even top up, it comes up with error performing request, unknown error. I can't receive calls or texts either, I can't use the phone side of my phone everything else like iPod, Internet etc is working fine, but nothing is working for my phone.
I've checked my sim card, I've made sure it is in properly, I've turned it off and on. nothing is working
what is wrong with my iPhone why is it not working, and how do I fix it.
Please someone give me some answers.
P.S. I have only had this phone for just over a year.

It sounds like an O2 problem, you'd have to get in contact with them on 0800 977 7337
Have you tried the SIM card in another phone?

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