These are instructions on how to replace the signal strength bars on your iPhone with a numerical representation of reception strength. (ie. numbers instead of bars)
Apple is working on future improvements to Find My iPhone which could allow a user to selectively protect data, remotely scramble data instead of erasing it, and transmit surveillance info back to the owner.
A Find My iPhone user managed to track his stolen car using the service but the thief managed to slip out of his handcuffs and run over the arresting police officer.