Why is there even more than one answer to this question?
Exactly.
If I found a phone in the back of my Black Cab, and I could access Contacts, I’d go through them, looking for home, mum, dad, etc., then call, explain the circumstances, give them my number, and wait for a call.
Then I’d arrange a meet, and hand it over, they’d almost always want to give me some monetary reward, but I’d say, “I can’t take it, my old mum always said, you don’t take a reward for doing the right thing.”
One guy gave me a litre of vodka as I gave him his phone, I thanked him for that and took it, another woman asked me to meet her at the corner of Eldon St. and Blomfield St. in The City and said that she’d give me £25, I told her that I didn’t want it, and wouldn’t take it, so as I gave her the phone, she threw a big box of chocolates through the open rear window, and said, “Give these to your wife then.”
If I couldn’t access Contacts, I’d hand it in to the police, they’d fill in a form, specifying the trip made by whomever I thought may have left the phone, e.g. 14.30, picked up at Fenchurch St. station, dropped off at Fleet St. 14.45.
If it wasn’t claimed within 3 months, I could present the receipt and claim the item.