Why is my iPhone sending picture messages as texts?

I have had an iPhone through Verizon since last June, and recently it has started sending all of my picture messages as texts instead of iMessages. I have a texting plan, but it's still frustrating that I can iMessage my friends any other time, but when I send a picture it becomes a text. I have checked all of my settings, and nothing has been changed. Does anyone know what could be causing this?

Turn off the setting that says send as regular text if it can't send imessage.

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