Friend: "You're a hacker, right?"

Me: "If you prefer to name it like that, yes"

Friend: "So... Could you hack a phone for me and get all images on it?"

Me: "Who are you again?"

I'd just say no and tell him to look up debug/developer mode through USB recovery.

If he asks: "soo..can you?"
Reply: "no. Refer to previous statement."

I'm not sure if telling how it's done, would be legal trouble for me if so happens though.

@lotd According to German law it is legal to explain how it's done, as long as you say that it shouldn't be used in illegal ways... But tbh I wouldn't even bother explaining it to someone like that

This happens to me ALL THE F*CKING TIME. If I had a dollar fit everytime somebody asked if I could hack somebody's Facebook account, I'd be filthy rich.

Sidenote: I also am a hobbyist security researcher.