I have been using Telecom Italia for the past two years and just today I decided to end this contract which is both expensive and not always reliable in favour of a TRE Italia setup. The set up is easy. Either get a 9Euro sim card (what I have now) and you just pay for the month you are using it in by prepaying. No contract is required and can then be mothballed till the next time you visit.
The sim card allows voice , sms and data. The data bit is limited to 50Mb per day which if not a heavy user should be very adequate for most email and some webbrowsing.
The shop installs a simple program on your pc and off you go. You either plug in your phone via the cable or simply bluetooth to the phone.
3 Wired Portal - 3 for you
Francis