Avoid iPhone being charged in Canada?

I'm from the US and I'm going to Canada for a day tomorrow. I'm not going to text or use internet as I don't want to be charged. To avoid being charged for roaming or anything, though, do I just need to turn off cellular data? Put it on airplane mode? Any advice would be great.

Yeah it won't go to that.

Yes, using Airplane Mode would disable the Wi-Fi & cellular (data) radios. Could use Wi-Fi afterwards if you so choose.

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