I was recently searching about this setup. Closest I found (off another website can't remember) was the Sena SM10.
^Wow.. Really? I'll do that at work! No more killing my batt! Thanks
Edit: and fail... killed the phone. I guess it doesn't work. :(
I roam all the time, I've called them to tell them their reception blows, I've asked about the Airave (not that I want it, I like my internet bandwidth thanks...), and I've never received a notice. Not my god damn fault their shit is shitty... K...
Decided to chuck my slim $2 case as it's all messed up. I decided to go naked although I put vinyl on the back cover. Think it came out well.
Xperia Z ultra doesn't have a removable batt or expandable storage. FAIL...