770 with a grandfathered-in voicestream (pre-Tmobile) data service on a Moto v360:

Mapper Maps download, email, RSS feeds, and even a webmail portal to MS exchange for work. The only problem is that Tmobile's service doesn't reach me in my interior office. I have to be in one of the meeting rooms to pick it up. But when it works, it's more reliable than the wifi hotspot available at ground level.