Six months in Canada - six months in Florida , can I use it in both places?
You will have so so coverage in certain areas, bet beware of their so-called Unlimited US Talk, Text and Data plan. They call it unlimited but it really isn't. They limit you severely but hide behind their Fair Usage policy that they don't tell you about, and cannot define the limitations. I would seriously advise you to find a different provider.
Of course, you can. Just don't forget to subscribe to a roaming plan.