Hi all ive now got a 1.1.2 OTB activated jailbroken iphone. Instead of waiting for the unlock for the moment i wanted to put an o2 pay&go sim in so i can use it as i phone until i can use my contract vodafone sim in. Trouble is it says no service but when i put my misses o2 contract sim in it works fine. I thought it may be tht the pay&go sim may be out of date but it works fine in her phone.

Ive read countless times on here that u can use ANY o2 sim contract or pay&go...so can someone please tell me what i should do or try to get it to work