I have a apple iphone 4s since i bought it 3g is not working. when i turn on the 3g it takes about 10 seconds to search the 3g signal. but it get only edge signal. when i turn on the mobile data and then turn on 3g it will on the 3g but for only about 5 minutes then it turns to edge. i tried this method in full 3g coverage areas. but still like that. i tried resetting the network setting and also did a factory resetting but none of them worked. my only option to connect to the internet is wifi. please someone help me with this problem.