I have recently bought a used N6301 on eBay just because it can do UMA and I have no signal around my home. It is a pain to swap the SIM over from my N900 when I at home (or remember to divert calls to the 6301). I find the 6301 UMA feature very useful and would pay for and app that enabled it on my N900. I don't really want to move to a Blackberry (who seem to be the only folks actively supporting it).

I don't need handover between 3G and wifi and I doubt that this would be a must have for many. If I start or receive a call at home, I am not likely to move out of wifi range while I am on the call. Conversely, if I receive a call when I am outside, I know not to go into the house until I finish the call!

Rgrds F