Using another iPhone's SIM card to unlock iphone?

This boy asked me to use my SIM card for like 5 seconds because he needed to unlock his friends iphone (he said his friend told him to sell it & he doesn't know the passcode). He kept insisting that it was only 5 seconds, so I just let him use it (he asked if I had AT&T first for my iphone-yes I do). Was he telling the truth? Was the only thing he did was unlock the iphone? Or did he use it for something else? It did take 5 seconds, but I just need to know if that's the only thing you can do with a sim are instead of hacking or something?

Should be fine, he probably just needed it to activate the phone, the newer ios versions need a sim card or Wi-Fi to activate the iphone to make it usable.

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