Lost my phone in a way that is almost unbelieveable. Need suggestions on how to find it.
My phone is an android. Yesterday before going to class (it's an extra educational program, not from any school), i put this phone into my backpack so that i can use it in break time. i remembered clearly that i've put the phone inside my bag because i can recall opening the phone to turn down the volume of notification alerts. However, during the whole 3 hours of class, i didn't use it, or even took it out of the bag. When i go back home, i take out that android phone right away but i had lunch. After having lunch, i went to take the phone out to play games on it, but i couldn't find it anywhere, that's when i realized that i've lost it.
So i did call the number on the phone several times. Sometimes it ringed as the call was delivered ,just not picked up. Other times i called, it said that the number is unavailable as if the phone is shut down, sometimes it works, sometimes it don't not like it completely went unavailable forever.
The phone consisted of 2 SIM cards , i called 2 cards at the same time once but one number is available ,the other is unavailable.
Is there any possible way to trace down the phone? Even with any app or tracing method that would work? The google account on that phone belonged to one of my member but they forgot the account and the password ( it was an old account)
Please share any informations you have that can help me get it back, thank you.