Stranger used my iPhone, can anything bad happen?

I was sitting in my car in a crowded and busy parking lot in daylight with my window open. A car pulled up in the space next to me. A shady-looking man came out of the car and clumsily stuttered about using my cell phone to check Facebook for an emergency (his friend was suicidal apparently). Unfortunately I'm a very passive person and let him use my phone. At first he checked his Facebook and tried dialing a phone number he got in a Facebook messege only to find that it was disconnected. I thought he would be done after that but he continued to use my phone. It looked like he was typing things or texting and every few seconds he would comment about auto-correct or something similar. It just sounded and looked fishy. I got my phone back and everything appears normal and fine but I'm wondering if he could have done anything to my phone or gotten any information or what-have-you from it. Can anyone enlighten me?

You'll be fine. No one would go through that much effort to do anything malicious to your phone

Dude don't worry cause if he was going to do something to hurt you he would've already done it!

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