How many stores sell smart phones? I'd ballpark it at 1 per 5000 people (that's what it seems like in my city) - so that's 60 000 in North America (or 25 phone

How many stores sell smart phones? I'd ballpark it at 1 per 5000 people (that's what it seems like in my city) - so that's 60 000 in North America (or 25 phones a store). It seems like a lot of that could be stock (or all of it, 25/store doesn't seem like a lot of stock). [refinement of numbers much appreciated]