Can the US Iphone 4s for Sprint be unlocked in Canada?

I've been looking everywhere today. Some say CDMA can't be unlocked, some say it can. Some say it can be done in 3 weeks, and some say in 4 days. Some say its a software unlock some say its a hardware unlock. Some say its $140 some say it $200
Can it be done and which route should I take?

No phones from the us can't be used outside of the country.