How do you put the phone back to default settings, essentially erasing any programming to start over?

The battery is back up ?

How many volts is required?

Is it possible to program a new phone number over an existing one?

Hello, how would you program one with out the number pad?

A very helpful demonstration. Excellently done. Informative and clear. Thank you, Janus Elevator, for this quick and to the point tutorial.