How to turn off iMessage on iPhone

Hey guys, Today I'm going to be showing you how to turn off iMessage on iPhone. iMessage, is a messaging system under iOS5 or later that announced by Apple in June 2011. It allows users to send texts, documents, photos, videos, contact information, and group messages over a Wi-Fi, 3G / LTE connection to other iOS or OS X users, in this way bringing an alternative way to standard SMS/MMS messaging for all users with devices running iOS 5 or later. So what you've got to do is go into your settings -> messages, and just simply turn the iMessage off. And it is officially off. So if we find someone in your messages who has iMessage, we can test if it works or not. Try to write something into the box and tap the send button, you will see a pop-up says "Cannot send message". We have to turn it back on to send an iMessage again. Okay, so you're gonna go back into your settings again and turn it on. It will ask for your Apple ID.