cannot connect to cellular service
My phone keeps saying "Searching" on top, and because of that I think it's causing my phone to lag. Buttons become unresponsive and so do tapping on them on screen. It starts freezing up and I think it's because it's attempting to get a signal with Sprint.
This problem did not happen yesterday but it has started today. I have done the factory reset and started it up again with the same problem.
Please advise.
iPhone 4S, iOS 5.0.1