ZTE isn't just backing championship NBA teams in the US, it's also backing a high-end phone dubbed the Axon.This Android 5.0 Lollipop handset, teased for a month with mysterious marketing campaign, is part of the Chinese manufacturer's plan to define an affordable premium handset.Affordable and premium are typically polar opposites in the world of smartphones, but ZTE is striving to make an inexpensive metal phablet that has a 5.5-inch display.