I'm actually on my third GS4.
First one had a bad battery and the main camera was off center.
Second was perfect but stupid sprint didn't provision the SIM card for 4G LTE and I exchanged it for this one and the same problem prevailed; everything worked except 4G LTE! :banghead:
Finally a forum mate; RicanS4 told me how he had the same problem fixed. And after several visits to different sprint stores and several phone calls to sprint tech support, I finally got it fixed! :thumbup:
Sent From a Galaxy S4 Away!