What is the information that I need to know about using my AT&T iPhone out of the country?

I have AT&T. I have an iPhone. I'm going to Cabo San Lucas through July 1st-July 5th. I want to use my cell phone to take pictures and post Facebook/Instagram updates, without getting charged for international rates. Suggestions? Like turning off data or using Wi-Fi or using airplane mode.

Use the phone in Airplane Mode and use Wi-Fi for uploading those pics.

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