When I am home or at gfs house, I have no problem using wifi to connect to the Internet. But when I am away from those places, I frequently get the "You are offline" notice when I try to access the Internet. I have both wifi and mobile network enabled, so if there is no wifi, it should automatically connect to the mobile network, right? I can still make/receive calls and texts, so why can't I access the Internet? If I restart my phone, then it works for awhile, but then it always reverts to not accessing the Internet again.