I found a cell phone, but when I try to call people in the phone to locate the owner it says unable to call?

Question

I found a cell phone, but when I try to call people in the phone to locate the owner it says unable to call?
How am I supposed to track down whose phone this is if it cant even make a call? I tried calling several different people in the phone book, but it keeps saying unable to make a call at this time.

Answer

try calling them from a different phone