About two weeks ago i started having a problem where unless I was connected to a wifi network i would have no data. Whenever I'm out my 3g/4g never pops up. I can't browse the internet, listen to pandora, etc. The one exception is when i go to send a picture or receive a picture my 4g will magically pop up for the second it takes to send the picture. It's really frustrating though because i pay for mobile data that i can't even use. I just want my S4 to start connecting to the mobile network again.