Minecraft PE 0.7.3+ Duplication Glitch for iOS and Android

First you put some stuff that you want to duplicate in an empty chest, than after the chest closed open it and take your stuff again and go away from that chest, run away from that chest for 13 second - 15 second and than exit the game. Close it on the multitasking bar (Task Manager for Android) and than open the game again and you will spawn closer with your chest and voila! there's some stuff on your chest. that's how you duplicate item on Minecraft PE.