iTunes without credit card
Hi guys, I am going to change my iTunes account' country from Italy to US
My italian account doesn't have any credit card specified, so, if I switch to the US account, will I have to use a credit card or can I use "none" as payment method?
I know that if I use none I won't be able to buy any paid app, but I really don't have a CC to use.
If I must use a payment method can I use a gift card?
and one last thing, will I receive the updates to the current apps I have?