What is Google Voice?

Google Voice gives users one number that can ring on all their phones -- mobile, home and office for example - depending on the rules they set. It includes a bunch of useful and free features, such as transcribed voicemail sent as email or text message, conference calling, outbound domestic calls, and call-screening. International calls are also supported, for a fee, but they cost a fraction of what phone companies typically charge per minute. Alternatively, if you don't want a new phone number to deal with, Google Voice can be used with your existing line with limited functionality. Now Google voice to open to US only.


Source - Google