Security codes for phones

These are the default passwords or security codes for the phones I've been involved with.

Nokia 7210 - default password "12345" (e.g. when trying to delete all phonebook entries)

Song A768 (Chinese) - default password "1122" (e.g. when trying to delete all phonebook entries)

Samsung SGH D807 - "00000000" (This needs a PIN2 code when trying to delete both SIM and Phone address books. But if you try to delete the phone and SIM address books individually, you can use the above password)
The PIN2 code is provided by the SIM card so you may want to check with the provider.