The cell phone owner is lucky you caught the kid who found it. I do hope you told his parents what happened. Not that most parents give a crap these days.
I told the father, who like me, is willing to do the right thing and return lost items. This same kid is getting the wrong message from his mom. I was at their home about a month ago, and he came in from the park with his mom and said he ‘found’ a football and was keeping it. His dad said that the ball was not his, and that he should have brought it to the ‘lost and found’, which the park clearly has.