Google Voice now will work with existing phone numbers. You can now can get Google Voice with a Google number OR with your existing mobile phone number. If you choose to use Google Voice with your existing number, you won't get some features (like call screening and recording), but you'll still get many others -- including Google voicemail).

Google Voice with your existing number, you'll get:

• Online, searchable voicemail.
• Free automated voicemail transcription.
• Custom voicemail greetings for different callers.
• Email and SMS notifications.
• Low-priced international calling.

If you decide to also get a new Google number, you'll get all of the above PLUS:

• One number that reaches you on all your phones.
• SMS via email.
• Call screening.
• Listen In
• Call recording.
• Conference calling.
• Call blocking.

If you already have a Google number, this new feature should also help with the transition to your new number, as you can now forward unanswered calls to your mobile phone to your Google Voice account.  This way, people who still call your old number will reach the same voicemail as people who call your Google Voice number.