Why would my phone have trouble with my WiFi, and my 3 computers don't? When I connect on my phone, it appears I have full strength, the incoming and outgoing arrows light up, but I can't do anything. This happened with my first S4 that I took back yesterday. When I first connect, it works, and then seconds later, it stops but the arrows keep lighting up like it's working fine. I can't keep using 4G because I have a low data plan. Should I call AT&T or my cable provider? Is there something in the phone that isn't set right?