It worked fine this morning when I was on my Wi-Fi but when I left home it won't connect to anything. It doesn't even send iMessages to other phones. What could it be?
My 3G isn't working on my iPhone 4S?
Try going to Settings->General->Reset-->Reset Network Settings, that will usually do the trick. If else fails call the carrier to see if there is something wrong with your service plans.
Anthony K 30.09.2013