" " An old smartphone can become a permanent GPS or music device. A Backup or 'Burner' PhoneIf your old smartphone still works, consider using it as a second phone. Even without a phone plan, that old phone call still dial 911, which may make it useful in an emergency situation. Make sure the old phone is loaded with the same apps and cloud access as the new phone. Baby Monitor or Security CamDon't spend money on a baby monitor!