Like christcorp I use sipdroid to connect to VoipO over 3G and WIFI.


The problem you're going to run into is Voipo supports G711 only which could be a little too much bandwidth for 3G, over wifi though you should be ok. Though I can see bandwidth, packet loss, and delay/jitter problems with calling from foreign countries.

My setup is a little different since I run asterisks and connect all my endpoints to that then connect to VOIPO as a trunk. This allows me use GSM when running over 3G.

Try it you really having nothing to lose.