3ITA phone for calling back to Canada/US: skype; wcdma
 

I note that 3 ITA has two plans that make calls back to Canada/US cheaper: 3Skypephone and International3.
My questions:
1) would my unlocked quad band GSM phone work for either of these, or do I need a special phone?
2) assuming I do need a special phone, can anyone advise what phones 3ITA offers for 3International and what they cost? I can't read the Italian website.
Thanks, Fred