Google Voice, which the search giant introduced in 2009, recently became freely available to everyone in the United States. Even though the service hasn't dramatically changed since then, it's still very useful to those that run small businesses, because it can give them an extra edge and make professional life much easier -- at least, it can if you know how to use it.When you register you can choose a virtual phone number in any area code. You can use that number to send and receive text messages, record voicemails and even receive and make calls over the Internet, but it becomes particularly useful when you attach it to the number associated with your mobile or landline phone.
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