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nanu calling app

Nanu takes on Skype with free 2G calls, limited free calls to landlines and mobile phones

The app will shortly be avialble for iOS and Windows phone, Nanu said

on pcworld.com

iphone side by

iPhone gets first free app for encrypting voice calls

Signal is compatible with RedPhone, its Android sibling, and scrambles voice calls placed via the iPhone.

line messaging app

You've got a call on Line, too: Line announces voice calls to traditional phones

The popular messaging service is taking on the likes of Skype and Viber with its new VoIP service.

Sprint to launch Wi-Fi calling, but slowly

Sprint plans to follow T-Mobile's lead and roll out Wi-Fi calling options, but just on two phones to begin with.