One year after the service debuted for U.S. customers only, Google Voice is going international. The service, which allows you to call anyone on a mobile phone or landline via Gmail, arrives in 150 destinations across 38 languages this week.

You’ll know when the service becomes active in your country when a little green phone icon shows up at the top of your chat list in Gmail. To get ready, you’ll need to install the voice and video plug-in. For a complete list of where Google Voice is, or will soon be available, check out the rates page.

For those that haven’t yet experienced Google Voice, take a look:

Google Voice is a service that gives you one number for all your phones, voicemail that is easy as email, and many enhanced calling features like call blocking and screening, voicemail transcripts, call conferencing, international calls, and more.  The service will be free, however it is currently available for Grand Central users only, but will be open to new users soon.   You can register for google voice here.