I love Google Hangout. It is a great tool to communicate with others whether 1-on-1 or whole class/group. It is Apple's Facetime with more options. Now, with the latest iPad app update there is a new option that is, well, fun and convenient! If you open the Hangout app on your iPad you are now able to make phone calls though your iPad! If you are a current Google Voice subscriber, Hangout uses your Voice number as the caller ID. No fear for those not subscribed to Google Voice. Your caller ID will come up on the receivers phone as "unknown". This is just another great Google tool. Head to the iTunes Store and download the Google Hangout app and give it a shot!
Below is the Google write up from the Google Voice Blog for more information: