Google Voice is testing a number portability service that would allow users to have calls transferred from an existing number to any device chosen.

Currently, the service gives users a new number for all their phones, as well as voicemail and many enhanced calling features like call blocking and screening, voicemail transcripts, call conferencing, international calls.

However, according to Techcrunch’s Michael Arrington, users will soon be able to move a long-held phone number to Google, and avoid the switching costs.

Arrington said that means you could switch your mobile number to Google and then choose where to receive calls – on whatever device you happen to have in your hand.

He said Google plans to roll out the service as a general feature later this year.

For outbound calls, Google is preparing to launch apps for the major smartphone platforms that will automatically route outbound calls through Google Voice.

Arrington said that means whoever you call will see your Google Voice number as the caller.

Google Voice is the Internet-based phone forwarding service by Google in the US. It was previously known as GrandCentral.

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