Does tmobile charge for iMessage on unlocked iphone 4?

I have an unlocked iPhone 4 for tmobile and I do not have a data/Internet plan. I recently updates my iPhone and it turned on iMessage and I said my company may charge me. But I don't understand why it would? I have picture messages and unlimited texting but it won't let me send pictures? Can anyone help me?

NO but make sure your on Wi-Fi or they will charge you but since you have unlmited text they will charge you but you won't have to pay overages. By charging they mean putting on the record you sent a text.

No iMessage uses Apples network

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