Do you want call across US and Canada with your Android based device for cheap rate? Then here is the solution that is Line2 a VoIP Application that enable you to make unlimited SMS and calls within the US and Canada for $9.95 a Month!
Line2 seems to be the same as Google Voice in that you get a new phone number. But unlike Google Voice, it will place calls over Wifi or 3G/4G data when available, or over the regular network when it’s not. If you have a suitable camera, a visual voicemail message can be sent by email and the app also provides call waiting, hold, transfer and even teleconferencing functionality.
Line2 is available for 30 day trial version, It’s unable to run on Galaxy S phones running Android 2.1 and glitch on the HTC Evo 4G although 2.2 Froyo devices should be fine with App.