Rogers has had an unlocking policy in place for awhile, but it isn't what most would call reasonable: an unlock isn't even an option until the contract is over, which could involve a 3-year wait and obsolete hardware that isn't worth the effort.
One day we'll be able to download all our music directly from the Internet, but you don't need to wait for that Buck Rogers utopia -- the Web is a great place to buy music right now.