Is iMessage on iphone free internationally?

I'm going out of the USA if a few days and is iMessage free internationally? Will i be charged if my leave my "Cellular Data" is on, meaning i will only be using Wi-Fi?

Yes, learn how celluar data and airplane mode work: http://www.gatorspit.com/tips/iphone-airplane-mode.html

Imessage is free as long as you use Wi-Fi and not 3/4G

As long as it is used on Wi-Fi only, yes.

"will i be charged if my leave my "Cellular Data" is on, meaning i will only be using Wi-Fi?"
--Leaving cellular data on would mean you'd have access to 3G/4G networks, not just Wi-Fi.

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