download smart tutor app from google play store and call Samsung contact center to solve ur issue remotely

try ur device on Safe mode due to may be the issue is from 3rd party app restart ur phone and when u see Samsung animated logo (in the beginning of loading) press and hold the volume key (the down one) until u'll find the home screen

yes no radio app embedded in s7

by downloading smart switch on iphone and it's an embedded app in s7 .. u can search for it open the app on both devices .. choose send from iphone and check on contacts and then choose recieve from s7