If you lose your Android Phone you can try calling the Android Phones Number if the phone is charged up and on.
I've had to call my own cell phones before from another phone such as my house phone or from my computer through a VOIP website.
That then caused the cell phone to ring and helped me locate it.
However if the cell phone is off then there's not much you can do but look for it and hope it shows up.
If your android phone has an account registered with google you can usually find it by going to android.com/find and sign in to your Google Account.
If you have more than one phone, click the lost phone at the top of the screen.
The lost phone gets a notification.
On the map, you'll get info about where the phone is.
Pick what you want to do.