OK i installed the app and everything works fine when im at my house. I can make calls and evrythings perfect. But, today i took my ipod to school to see if it would work there and when i typed in the number and pressed call the screen froze. So then i took my ipod to the resteraunt (which connects to a different wifi than the one at my school) and i dial the number press call, it doesnt freeze but nothing happens after it. It doesnt ring or anything. I am at home right now and it is working fine. Does anyone know why this is happening?