Google Voice is a telecommunication service by Google
Google Voice Invite

Its a phone management service which provides a US based Number to user and through that number he can bind his multiple numbers like mobile number, office number and home landline number.

User can track his all incoming and outgoing call through Google Voice Number.
Google Voice can be use in Two different modes.

With your existing number
With Google Number.

Google Voice with your existing number provides the following features:

Google Voicemail – Voice mails in your inbox as text email.
Voicemail transcription – Read what …