IPhone iMessage, data usage?

Does iMessage for iPhone constantly use data in the same way for example keeping Facebook open, or keeping Location Services on? Or, does it only use data when sending the actual iMessage?

Just use data for sending message

Very little data would be used either way. If you are on contract, then you're in luck. If you send 30 iMessages a day while keeping it open, you are looking at tops 10 megabytes in a month.

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