i keep my old ones (well the more recent "old" ones) as backup - my work supplied one was crappy so I'm using one of my old mobile phones and the work one is in the drawer at work.
I also use one of my old bluetooth ones as a backup for all phone numbers/details, on a regular basis I copy my address book to the old phone.
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1963 Chev Impala | Black | 2 door : <- Angel
Mazda 2 | Turbo (custom) | Spicy Orange <- punkin
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