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>You might think of the US as one of the most advanced mobile markets.

Advanced and quality aren't strictly synonymous. Going by the chart the article references, Canada crushes us in terms of quality but I still wouldn't want to move from an unlimited plan in the USA to a Canadian equivalent due to pricing schemes (the business kind not the conspiracy kind) for unlimited plans in Canada. In that sense I'd argue the USA offers more advanced market choices, but not necessarily a plethora of high quality ones.