That'd add the BlueTooth support, yes. No GPS, no packet radio (WWAN), no GSM/SMS, no vibration, no microphone. Maybe with hacky 3rd party hardware and jailbreaks some of this can be provided. My point is that it isn't as simple as 1 difference. And that difference isn't modular. There is not 1 difference between N800 and N810 either; each has their strong sides and userbase.