Switch to Android
In a April WABetaInfo had also give update that whatsapp will soon allow user to move chat between Andriod and ios devices.This feature is give with security to move chat history with the help of third party application ‘switch to Android’.
WhatsApp to allow chat history migration between iOS and Android in a future update! Finally you will be able to transfer your chats between different platforms natively! It’s under development and it will likely be released when multi device is out.