iOS - CallKit

Last Updated: Mar 02, 2017 03:22PM PST
CallKit is a new feature for iOS 10 for inbound calls from VOIP apps such as textPlus. It allows inbound calls to look just like a native inbound call shown below. It will display "textPlus Audio" at the top. Be sure to have iOS version 10.2.1 or higher. 

To toggle CallKit on or off, go to Nextplus > Menu > Settings > CallKit.