The sales from the 250 or so dedicated phone shops that Best Buy has around the US, are barely cracking a percentage point of its revenue, and these have to go now. People are increasingly buying smartphones on their smartphones, researching and ordering online from their carrier, or from Apple or Samsung, so a specialized store seems like a relic of the past.
Funny enough, people are often getting the new models directly, without even going somewhere to play around with them first, as even before a phone is announced now, more or less all the important design and specs upgrades are already known, and it is previewed extensively down to the smallest detail shortly after launch.
Back in 2011, Best Buy had the intention to open no less than 800 of those 1400 square feet stores around the country, but the consumer habits' shift, and the general demise of brick-and-mortar locations, have apparently nixed those plans.
source: Market Watch