Let the hive mind of Engadget get that for you.
"I'm in the market for a new phone and money isn't a limitation. I'm also not partial to any particular US carrier, but here are some of the features I'd like to have: WiFi, GPS, good coverage in lots of places, push Gmail (a must!), physical keyboard (a must!), a touchscreen, decent battery life and a relatively slim body. And please, nothing that has a fruit logo on it. No offense to the fruit fans, though. Thanks!"
"Yes. Calls originating inside the AIRAVE coverage area transfer to the Sprint Nationwide Network once you leave the AIRAVE coverage area.
Note: you will be billed at your regular wireless plan rate for the portion of the call that has been transferred to the Sprint Nationwide Network."