Deregister iMessage. You may need to turn off iMessage if you are now using a non-Apple phone and can't get SMS or text messages someone sends you from an iPhone.

What does turning off iMessage do?

Turning off the iMessage slider on your iPhone will stop iMessages from being delivered to your iPhone. ... Even with the iMessage slider turned off, your phone number is still associated with your Apple ID. Therefore, when other iPhone users send a message to you, it is sent as an iMessage to your Apple ID.

What happens if I turn iMessage off on iPhone?

If you turn it off, you can't send or receive iMessages. You can send and receive standard SMS messages via your wireless cellular provider assuming that you have a plan that includes texting.