Deregister iMessage on your iPhone or online
![](https://www.imageek.pro/wp-content/uploads/2016/09/iphone6-message-settings.jpg)
we discovered that the phone would not receive any SMS from iPhone users. I deduced that the issue had to do with iMessage. So a quick check of the web showed that there was a utility on the Apple website to "deregister" your mobile number from using iMessage.