I found a phone can contact the previous owner?

Hey

Unless the previous owner has enabled "Lost Mode" on Find My iPhone and a phone number is displayed on the lock screen then no.

Best thing to do is take it to the local police station.

You can also try plugging in the device and saying "Hey Siri, who owns this iPhone?"

If the owner set up Hey Siri and identified "my info" under Settings > General > Siri, you may get some information.

Hold down the home button and ask Siri 'who does this phone belong to'... if the owner set up their contact info correctly, it should tell you.

No.