Just took my S4 on a long road trip through Utah and was absolutely shocked at how good the reception was. I'm standing on a ridge above the amphitheater at Bryce Canyon getting full LTE coverage. I actually posted a photo of myself on FACEBOOK from the top of Angels Landing in Zion. I was also able to get 1 or 2 bars of coverage (not LTE, of course) on some back trails in Caynonlands National Park and all through most of Arches. I really did not have any reception issues until I got into the Grand Staircase-Escalante region. Anyway, I know reception is all about the availability of cell towers, but the phone's performance was stellar.