Last night my jailbroken iPhone (on o2 contract but not the iPhone one) suddenly started showing No Service in the signal bar area. This is not my sim card as it works in my trusty Sony Ericsson fine. The only thing i can think of that i changed before this happened is i installed SwirlyMMS but i cant think how this would be a problem. I do occasionally get 1 tiny bar of signal and the occasional SMS coming through but not often. I tried restoring the iPhone to 1.1.4 but no luck there. My iPhone has modem firmware 04.04.05_G which was installed by ZiPhone. If anyone could help i would be really greatful.