I only get pictures as text messages not as iMessage?

I have an iPhone 4S and recently I can only receive pictures if it is sent as a text message rather than an iMessage. This is really frustrating for group chats especially because whenever someone sends a picture they have to send it as a text too for me to see. I don't know why it does this now because it has never done it before. I went to my settings an made sure everything was right and it was. What else do I do to fix this?

Try resetting your iphone by holding sleep/wake button util apple logo pops up

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