no service on iphone 4 new sim
I just took over my sisters old iphone 4 got my orange sim cut and it was working fine for the first few hours. Was playing around with it and signed into my apple I'd then all of a sudden I had no service and can't seem to regain it. Iv turned it off and on again but to no avail. As I don't reallyknow what I'm doing I don't want to mess around doing things that could mess it up worse. Do I need to sync it to my own I tunes or just restore it all together?
iPhone 4, iOS 6.1.3