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It does essentially give you number portability.

1. Set up Google Voice to forward your GV # to your cell phone.

2. Install the Google Voice app to get push notifications for SMS messages sent to your GV #.

3. Give out your GV # instead of your cell phone number.

4. Change the forwarding rules at will -- you can even use the same number for multiple phones.

Number portability in this context means the ability to use an existing number with new service, not the ability to use a new number which points back at your existing number.

Google's been on the record for several years as hoping to support this in the future.

http://www.google.com/support/voice/bin/answer.py?hl=en&...

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