I think gnokii is definitely going in the right direction. A little more tweaking here and there could make for a good implementation of number display on the 770 for when your mobile (connected via Bluetooth) is in your bag or pocket... Wouldn't it be.. nice?

fredoll - would love to try out your app... but still awaiting my 770. Hopefully in my hands no later than this time next week. BTW, I'm in Japan and managed to snag one through ebay.