Can you help me track the phone by its number? Is it possible to find the lost device?
No, Without installed TiSPY APK on the device we can not help you to find the location of that device.
Also, you can not find the location of any incoming unknown phone by its number. More details you can refer to https://tispy.net/blog/track-your-caller-with-incoming-call-location-tracker-app.