Tonight I was streaming music and the stream stopped. I looked and instead of 3G or LTE it showed 1x. Needless to say I couldn't get any connection while on this. What is 1x? I'm new to Sprint and my phone is the Nexus 6. Also... previously I was an AT&T subscriber. While on AT&T I never saw 3G..everything was either 4G or LTE. Isn't 3G old technology? Why does Sprint still use 3G?