Is this a place a person who has been drinking might decide to go for a swim at night? Could he have placed his phone and his coat (or whatever, I don't know which clothes were found or how the phone looked when found, placed carefully somewhere away from the water or dropped accidentally close to the river?) to go into the river for a night-time "dip" under the stars?
(I realize the water was probably very cold.)
I'm just trying to figure out if he fell into the river accidentally, why his phone didn't go in with him. No matter how, it sounds like a true accident at this time.
Poor guy.
My heart goes out to his parents and other relatives .