Google seems set to launch its Google Voice service, as it has reserved more than one million numbers with the service provider Level 3, according to a report by Gizmodo.

Google Voice service is expected to give you one number for all your calls and SMS. The service reportedly provides features such as call screening – to announce and screen callers, block calls and call US numbers for free. It also provides voicemail transcripts, listen to voicemail, receive voicemails via email or SMS and forward or download voicemails.

Other features include conference calling, switch phones during a call, check directory assistance and set preferences by group. It also enables users to view the inbox from their mobile.

Google has acquired GrandCentral in March 2007. Google Voice is the next version of GrandCentral. Google Voice is currently available for GrandCentral users only. However, there has been no news from Google yet about the launch of the service.