Enter a new entry in the "Phonebook" of the phone using 2 as the phone number (yes, just the number two, nothing else) and select the mobile phone as the location for the entry (not the SIM card).
When you press the ‘Save’ soft-key, a screen appears with the lighthouse graphic from the 35-series and a scrolling display of the first names of all the software developers.
It is crucial that you use the "Phonebook"; do not use the "Addressbook", which most people probasbly use as their default phone book!
If you leave the entry in your phone, you can recall the credits by simply viewing it, and then just using the ‘Edit’ and ‘Save’ soft-keys again (i.e. it works on every save).