Can i use my US iPhone in Canada for vacation?

I don't want to use it for text msgs. I want to use it to iMessage ONE friend. I'm going to turn of voice roaming and data roaming. I will also turn off the data every single app on my iPhone uses. Can i still keep my 3G on to iMessage someone or will i be charged international costs?

You could put it in Airplane Mode & turn back on Wi-Fi afterwards. You'd be charged for roaming for using 3G.

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