I found fring total crap when I tried it with my italk and 2talk accounts on my phone, but the native N95 sip client works great over 3g *so long as your not moving* and means that I can get away with no voice plan and not pay thru the nose for the odd phonecalls when I am out. Plus it confuses people to have a local number come up when I am calling to ask which house in the street is theirs ;)