This is annoying me!!! I have an iPhone 4S and a 3G data plan. It happens that sometimes the 3G icon disappears (even in an area that HAS 3G signal) and I cant access internet. Then, for some reason, it appears again like if nothing had happened. My concern is with the 'find my iphone': if I lose/get robbed someday, how can I trust it? I've called my 3G operator and there's nothing wrong with it. So, my question is: is there anyway to make iphone keep 3G on all the time? I know that the "phone data" (or something similar - my iphone is not in english) has to be turned on (and it is), but is there anything else I should do?