"Please launch WhatApp to receive messages"Is a message that appears on the iPhone screen or Android smartphone and worries many users WhatsApp.
At first glance it would seem to be a change in WhatsApp, which forces the user to leave the WhatsApp application open permanently in the background to receive messages.
The good news is that this warning occurs only after an important update of the application WhatsApp Messenger, and indeed, if you do not open the application, you can not see new messages received.
This is only valid immediately after the update, until the application optimizes and the new changes apply.
After WhatsApp Messenger has completed the optimization process, you can shut down everything. You will still receive messages as it happens before you receive the "Please launch WhatApp to receive messages"