i-vent-Mindreading with a borrowed iphone

Imagine approaching a complete stranger, you tell them you are going to create a unique event that they will never forget. You ask them to think of any word, their pin code anything they desire and then to add it as an event in their phone. They lock their phone and there is no way you can access the information. Suddenly you can reveal the thought of word/number etc.
Never handle the phone
Impromptu
No gimmicks

Have one spectator message another spectator and instantly know what the message says, divine what apps they use all with this technique.