I found a useful website that lists a number of handset codes for S60-series phones.
What’s very handy is that it lists a number of reset codes that could be useful if you get unstuck with your phone.
If anyone knows me, they’ll know I have a love-hate relationship with my Nokia N80 and Orange. This helps me to try and resolve some of my long-standing issues.
Naturally, make sure that you back up your phone settings before doing anything daft.