Sometimes you will encounter a situation where you can not send messages through iMessage successfully and the phone will immediately suggest you use SMS instead. This article will tell you how to switch back to iMessage from SMS.
If the iMessage service is unreachable when you want to chat chit with your friend, the phone will automatically ask if you want to send the message via SMS instead. It means that you will have to pay a fee for sending messages to your friends and iMessage can be turned off completely.
How to turn the iMessage feature back?
To get this feature back to your iPhone, you should go to Settings and then choose Messages. You will see the icon OFF-ON here and remember to flip the switch for iMessage from OFF to ON.
Moreover, you can also turn the “Send As SMS” feature off entirely to avoid sending iMessages as text messages in the future when the iMessage service is unavailable.