Repeat Step 4 & Step 5 until your iPhone stops trying to automatically send your texts to that Contact via iMessage. Follow the steps below to turn off iMessage. If you don't want messages or notification of iMessage on your Macbook then you can simply disable iMessage.Hold your finger on the new text “bubble” and select “Send as Text Message”.In the message field, type “?” and tap the Send button. But while Apple's iMessage is beloved by iPhone users everywhere, there's a reason you might want to turn it off.
If this does not resolve the issue, it may related to the other users’ devices. After doing this, close all apps and restart your phone by holding down the Lock button and the Home button for ten seconds. In the To field, select the Contact that you wish to stop sending texts via iMessage to. Try disabling iMessage in Settings Messages iMessage.After a bit of searching, I discovered on a forum that after you force a number of iMessage txts to “Send as Text Message”, your iPhone gets the point, and stops sending iMessage texts to that person (though no one could agree how many texts that needed to be forced). This is great! However, you don’t want to have to do this EVERY time you want to text someone who has broken their shackles and fled the Apple Eco-system. Then, in settings, I turned imessages off and then on again. Of course it has a different name, too: Jane SMS Doe instead of Jane Doe. Then I made a second contact entry that has the phone number, but no email address. So, for those of you who don’t know, if you send an iMessage from your iPhone and it is struggling to get through (classic example of this occurring was during the Boxing Day Sales at our local shopping centre… too many people have iPhones these days :P), you can hold your finger down on the iMessage bubble and you will get the option to “Send as Text Message”. I deleted the phone number from my sister's contact information. This led to messages never getting to him or failing. However, my iPhone insisted on sending iMessages to him even though his mobile number had been ported across to the new phone. So, I had this issue: my Father-in-Law had replaced his iPhone with a Samsung Galaxy III.