Have you tried Joiku Spot on your E51? The basic idea is that it turns your HSDPA connection into a wireless access point that's usable by any wireless devices....
The versions of S60 shouldn't matter. Both the N70 and the N95-3 have Bluetooth 2.0, so I see no reason why it wouldn't work. The problem is getting the application to work in general. I'll let you...
Or you could do what I'm trying to do. I keep my N95-3 and my N810 with me all the time and I've read about running phonelink and contactinfo to route all calls and SMS through the tablet over...