Google today updated its Hangouts service with the ability to make free voice calls from Android and iOS devices, as well as from the web. Hangouts users can call one another and regular numbers in the U.S. and Canada without incurring any costs. Google says calls to other countries will require fees, but its rates are low. Google plans to make Hangouts version 2.3 available to Android devices over the next few days, and users wishing to make calls will need to install an additional dialer. The feature will show up automatically in the iOS and web versions of Hangouts. Hangouts users are already able to use the app to send IM and SMS messages, as well as make video calls.