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iOS 10 supports this with CallKit. The "Call" action in the Phone UI can call through Skype, Messenger, WhatsApp, FaceTime, etc. and receiving a call looks like
by conradev 9y ago
iOS 10 supports this with CallKit. The "Call" action in the Phone UI can call through Skype, Messenger, WhatsApp, FaceTime, etc. and receiving a call looks like the native phone UI.