I have 2 of 4 28031 handsets labelled "handset 1"!??

Select the Mute/Program button above the 3 on your keypad of your phone.
Next select the arrow down key until you have hi-lighted 'Handset setup' then hit the 'Mute/Program' key again.
Next select the arrow down key until you have hi-lighted 'Handset Name' then hit the 'Mute/Program' key again.
Now enter with the number pad a name for your phone such as "handset 1' or "Backroom" or "Kitchen"

George Szabo
December 2008