Well, specifically you forget where to put Android phone, I will serve how to track Android phone lost with Find My Device. Citing information posted on CNET on Friday (5/6/2017), here's how.
Especially for older Android devices, you can go to Settings and tap the Android Device Manager. To enable this feature, tap the "Allow Remote Factory Reset" box and tap "Activate".
If you are logged in, a dashboard menu will appear showing where your phone is located with several options. First there is a location option that shows the location where your Android phone is placed, complete with battery power that lasts, until when the last phone is turned on.
► Third, Lock option. As the name implies, this feature will automatically lock your Android device. So, no one will be able to access your Android device. To lock the phone, click the Lock option, enter the new password twice, and type in the number that can be reached when the phone is found.
► Last is the Erase option. This option allows users to manually delete all data from Find My Device. This feature will automatically delete all data, including apps, photos and videos, music and everything. If your phone turns off, this feature will work once it is turned on again.