Is there something to this? My Nexus 5 is on T-Mobile. Calls from my girlfriend 's Droid Razr Maxx on Verizon sound like your typical cell phone crap. Calls from my cousin who also has a Nexus 5 on T-Mobile, however, sound ridiculously clear and precise. It's more like a Hangouts call via my desktop. Has anyone else noticed a difference? I didn't think the Nexus 5 could do HD voice.