I've found 2 so far. One was owned by a woman who'd lost her previous phone shortly before that and went from thinking I'd stolen her phone to being grateful to get it back. Extremely grateful. The second belonged to another bicyclist who'd lost his seat bag containing his phone. The was before smartphones and before I gave up on wearing contact lenses and I was barely able to read the display to start calling people. First person I reached was the owners son who thought I was up to no good (sensing a pattern here?). The owner pedaled up shortly after that and was grateful for the help, and I'm hoping I don't end up losing mine.