Had that happen today as I was coming in to my place from outside, seems as if on the airave faq that you will continue calls on sprint network even though your within airave coverage.
Took my phone a drop call to reconnect to the airave .... thats the only hiccup in the system since i have poor tower service in my apt....
Vice versa works tho (going from airave to the outside) ...
Duno the exact number act. services but just ask to be transfered usually works for me...
PS-100th Post here...
