oopsie--i left mine on a counter at a store.
the clerk called the last number called
(there are usually menus to find
missed calls, dialed calls, and received calls)

and got my daughter who got the phone back to me.

best to do this a.s.a.p.
while it still has power!

some programs exist to donate used phones to for
charity and also there are places to recycle old
ones.

glad you found the owner...