MoSIP mobile dialer
MoSIP is a soft phone application to make cheap VoIP calls directly from your mobile. You have the liberty to make calls to any country of your choice without bothering much about your call rates. It comes with a host of features - works with low bandwidth networks, runs behind NAT and on private IP, works with existing SIP/IPPBX/any standard softswitch and much more. It is currently supported by a host of mobile platforms like iPhone, Android, Windows, Symbian and Blackberry.