IPhone 4 won't let me send picture messages through texts but only with iMessage?

I just got texting on my phone but they said I'd get unlimited texting plus free sending picture messages, but when I tried to click on the picture thing, it didn't open but the picture thing looked grey as if I can't use it but when I use iMessage, it was black to where I could use it. Anyone have a solution?

Lol maybe its time to upgrade.

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