Having trouble with receiving one call in two different iPhones at the same time? You have no idea why is this happening?
We have all the answers. It’s because some users decides to have one and the same Apple ID on both iPhones. That’s why we suggest to use a different and unique Apple ID on one idevice. To turn of this function go to Settings/FaceTime/iPhone Cellular Calls/Off 
Just remember that turning of this call pairing function does not stop sharing same iCloud details like contacts, photos, videos and so on.
