Best Buy Company (NYSE: BBY), which is cautiously taking on market share from the now-defunct Circuit City while weathering the economic recession, is pouring more of its heart and soul into the mobile arena. The largest consumer electronics retailer in the U.S. wants to take double-digit market share command of the mobile handset industry within five years.

Best Buy (NYSE: BBY) is always looking to pump up margins in the game of consumer electronics retailing. While products such as flat-panel TVs and computers can carry razor-thin margins, products like Geek Squad services and mobile phone plans (and associated commissions) can carry heftier and more lucrative margins. Who doesn't like that?

When Circuit City (NYSE: CC) got out of the mobile phone business a few years ago, I thought it was a pretty lousy decision. The retailer's exit from the major appliance arena as well was probably an attempt to devote more square footage to faster-moving products. While Circuit City still does not carry cellular phones and plans, larger competitor Best Buy is expanding that part of its business. But why?

Well, according to Consumer Reports magazine, more than 80% of customers have trouble shopping for mobile phones. According to mobile customer Ally Wisel, it's a "nightmare experience" shopping for a mobile phone, with "customer service" being horrible. Perhaps it's Best Buy's attention to the customer service experience that is making it dive deeper into the cellular phone and calling pan business.

Lately, the nation's largest consumer electronics retailer has been all about building stronger relationships with customers. With the cellular calling plan business having better margins than many other categories, Best Buy's strategy here could be a great one for the company, taking the company's profits and share price to new heights. With Best Buy opening hundreds of mobile phone-only "Best Buy Mobile" outlets in coming years, the company may become the place to buy that new phone and calling plan, much to the chagrin of Circuit City and Radio Shack (NYSE: RSH) as well.