Why won't my iPhone send pictures as a text message?

I'm signed up for the unlimited everything plan on sprint. But for more than a few months now my iPhone stopped letting me send pictures as text messages. Every time I try to send a picture as a text (not an iMesaage) I get a text saying "SprintFreeMsg: The account holder has restricted access to this feature on this phone". Why is it doing this, and how can I fix it?

Added (1). Mms is not turned off

Added (2). Mms is not turned off

Mms is probably turned off

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