Based on the Tytn II handset from HTC, O2’s XDA line-up includes some pretty impressive models, and the XDA Stellar is the first to include both built-in GPS and a Qwerty keyboard.
Satellite navigation is taken care of by Copilot Live 7 software, included in the package, while Windows Mobile 6 drives the phone.
Measuring 20mm thick and weighing 190g, the XDA Stellar will be too bulky for many, but if you want a Qwerty keyboard you’re going to have to make some sacrifices. Slide the screen to the left, and the keyboard is revealed. With such little space between keys, typing is awkward at first and most definitely a two-fingered operation only. The tilting screen makes it perfect for sitting on a table to watch video.
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As compared to O2 Atom, the battery life is worse and the speakers is not as good.
If you turn off the HSDPA and 3G, the battery life improve quite a lot.