Dun/tether On Italian Prepaid

[Effendi]

Well, of course I hope your Treo 650 is the GSM version and not the CDMA one, otherwise it's of no use in Italy. If it's the GSM it will work perfectly (it's quad-band) but it doesn't support EDGE, so you'll use GPRS in any case, both with Wind and TIM. WInd offers EDGE too, but only in limited areas, while TIM has nationwide EDGE coverage.

I don't understand exactly what's the problem for the connection... probably because I don't know the meaning of DUN and tether!

Anyway with both TIM and Wind you have data plans and you can use them on your Treo (if it's unlocked, of course). Usually here people prefer to use Wind, which works outside of Italy as well. There are tons of discussions about it!