How can I only send imessages and not texts on my iphone 4S

I have turned OFF Send as SMS on the settings of my iphone. However the phone still allows me to send text messages using the message facility. I am aware that green equals text and blue equals imessage.
I would however like to disable or at least have a reminder before sending a text in order that I do not get billed for sending photos attached to text instead of as imessages
I thought that turning OFF Send as SMS in the settings field would prevent me sending texts and only allow imessages to go out, but this does not seem to be the case
Regards
Dave

You can turn off sending pictures messages except as iMessages by going to Settings>Messages>MMS Messaging and setting it to "Off".

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