Gerbick
On others phones, i can simply use the micro SD card ... this is what i do with my Nokia E90. You can use Bluetooth to to share files ...

What you are telling is VERY intersting to me so :
- is your iPhone jailbroken ?
- are you in OS3 ?
- can you share your internet connexion from iPhone to the tablet ?
- to exchange files between N8xx and iPhone, how does-it works ?
- can you make a document on your N8XX, transfer it to the iPhone and then, from the iphone, send it by mail ?

Depending on your answers, I could replace my E90 by an iPhone and then have a complete solution with iPhone + N810 !!!