Definitely airplane mode and turn on WiFi if you want to have the device on at all.
A friend found out the hard way that even if you don't send any texts, don't use any data, and don't make any calls, if someone calls your phone and it goes to voicemail and they leave a message, you get billed time for the time they're leaving the message!
At least on Rogers/Fido anyway, and this was confirmed to me by them the last time I went to the US. I got a 1 month international something or other for when I was down there.
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