Google Voice is just one of the many projects that the folks at Google have been working on, and if you need to communicate across a variety of formats and phones, this service is quite good. Visitors can use the Google Voice device to make phone calls from their Gmail account, create personalized greetings, share voicemails, block callers, and also call internationally. A series of videos on their site explains each feature, and this version is compatible with all operating systems.