Google has made its Google Voice service available to all, Google said Tuesday.

Following invitations from Google itself and their friends, bout a million users have already downloaded the Google Voice client, which allows users to set one number that rings all phones connected to the Google Voice service, transcribe voice mails, and easily block callers.

"We're proud of the progress we've made with Google Voice over the last few years, and we're still just scratching the surface of what's possible when you combine your regular phone service with the latest web technology," Craig Walker and Vincent Paquet, Google Voice product managers, said in a blog post. "It's even more amazing to think about how far communication has come over the last couple hundred years."

In March 2009, Google transformed the Grand Central voice service into Google Voice. Since then, Google has released both Android, BlackBerry and iPhone versions of Google Voice, although Apple initially blocked the service, which it later denied. The FCC also queried Google about whether it could connect calls in rural areas.

New Google Voice users can either opt for a new number or keep their old number, although by doing so they lose a few features. If a user opts to keep an existing number, they can still use Google Voice for online, searchable voicemail, and free transcriptions; custom voice mail for different callers; email and SMS notifications; and low-priced international calling. Choosing a new number allows users to screen, listen in, and block calls.