IMessage is using cellular data over WiFi?

Hi,
Today I've noticed that even if I'm connected to a WiFi, when I'm sending/receiving an iMessage, the cellular data usage statistic is increasing with a couple of KBs.
I don't understand...wasn't supposed that an iMessage will use the wifi network when it is available?
Regards,
Bogdan

see this discussion http://discussions.apple.com/message/16497626#16497626

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