You read that headline correctly, Google Voice now works with your existing mobile phone number — no need to choose a new Google number that must be communicated to friends, family, and co-workers. This “lighter” version of Google Voice then lets you hand-over voicemail responsibility (and your data) to Google’s authority where you can listen to (or read via automatic voice to text conversion) your voicemail on a computer (in any order you like), read them as text messages on your phone, and choose personalized greetings by caller.
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Google Voice can now manage your cellphone’s voicemail (video)