Ever since I got my iphone 5 whenever I leave my house (wifi) it should go to 4g or LTE but it just shows the AT&T sign.. and for me to get Internet connection I have to turn off the phone and turn it back on. random info (2nd day I got the phone I suddenly got No sim installed and I took the sim out and cleaned it and I got service again) could this be the reason why I don't get Internet connection sometimes. and I always get 3-4 bars every where I go. I also tried the airplane mode to reset the cell connection does not work. could it be a sim problem? phone? Any ideas?