Why doesn't my iphone receive an imessage?

Enter the settings, click SMS to confirm that imessage is on (activated), click Send and Receive below, and select the mobile phone number. If the mobile phone number is grayed out, first cancel the apple id of imessage, and then reactivate imessage (activate with the mobile phone number, that is, click Activate again). See if the following transceiver is a mobile phone number. If so, try again, and im and SMS will be integrated! Ip5 6. 1.3 is set like this.