No Service / Searching iPhone 4
Hi,
I have an iPhone 4 which I got as a gift and it was updated to 5.0.1 when I first got it. The problem is that it keeps going to No service/searching whenever I leave it idle, but I've noticed that if I keep using the network e.g. calling or texting, it rarely ever loses signal and if I reboot it, it starts getting full signal again.
Any help would be greatly appreciated,
Thanks in advance.
iPhone 4, iOS 5.0.1