Turning off a lost iPhone 6s
My iPhone is lost, and I want to shut down the possibility of others reading my stuff, 'contacts', emails, messages, etc. Can I do that from my Mac Air or from an ipad that has no Sim card?
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You can set it to lost mode so it gets locked, from a Mac or an iPad as long as the iPhone has find My iPhone turned on, but you cannot actually turn it off.
See here: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support
