WeChat has revamped WeChat Address Book (our translation), which previously was for caller identification and contact backup only, with the addition of free voice calls. WeChat Address Book Adds Free Voice CallingThe addition of call features is a natural step for mobile messaging apps. Free voice calls is a killer app in many developing countries. Talkray, whose selling point is free calls even with slow mobile internet connections, is popular in countries like India. China Telecom has teamed up with Chinese internet company Netease, with their joint venture’s messaging app EasyChat offering a certain amount of international calls for free.