Last month, Google announced that Sprint was integrating Google Voice, allowing using customers to use their existing Sprint mobile numbers as their Google Voice numbers, and having it ring multiple other phones at the same time. Today, Google announced that the integration has gone into effect.

As Google explains on the Google Voice blog, there are two options for Sprint customers:

Option 1: Keep your Sprint number: Your Sprint number becomes your Google Voice number so that when people call your Sprint mobile number, it rings all the phones you want.

Option 2: Replace your Sprint number with your Google Voice number: All calls made and texts sent from your Sprint phone will display your Google Voice number.

“In both cases, Google Voice replaces Sprint voicemail and international calls made from the Sprint phone will be connected by Google Voice,” says Google’s Patrick Moor.

It gives Sprint customers transcribed voicemail messages, which are available online and sent via email and/or text message.

The feature is available in the U.S. It is being rolled out as we speak.