Let the hive mind of Engadget get that for you.
"I'm looking for a solid state drive, around 32 to 64GB, for use in my web server. The drive will contain my web sites and the operating system, either Windows Server 2008 R2 or Ubuntu. Large storage is handled by a separate RAID array, so capacity is not an issue. Rather, I am looking for the fastest, longest-lasting, and most reliable drive under $150 that is suitable to my application. Any thoughts? Thanks!"
The question is: what phones are supported, what moile OS's are supported, what are the hardware requirements, and how much is the service.... that would depend on the carrier, I am sure.
Also - the phone has to have a GPS, so that obviously beings down your list of qualified hardware choices. Thats fine, but dont make it sound like all I have to do it drop this into my SK3 or blackberry and I am good to go get lost.