Google adds audio calling to Duo and file sharing to Allo

Google's video calling app Duo and messaging app Allo will soon get some oft-requested features. 

Google announced the changes to its communication apps, as well as some upgrades of other apps in services, at an event in São Paulo, Brazil, on Wednesday. 

When Duo originally launched, it had an odd omission: You could use it for a video call, but not an audio-only call. Now, Google fixed this; the company says audio calls will work well even on slow connections and won't eat up much data. The feature is live in Brazil now, and will be rolled to the rest of the world "in the coming days." Read more...