Best Buy, Inc. (NYSE: BBY) continues to delve outside its retail roots and add services anywhere it can. But, this latest venture is a bit baffling: backup services for your mobile phone?

Walk into most Best Buy (NYSE: BBY) stores and you'll see multiple wireless carriers selling services and phones. While competitor Circuit City Stores (NYSE: CC) withdrew from this market some time ago, Best Buy has expanded its involvement and now offers phones and service from the top carriers in the U.S., including Verizon Wireless, Sprint Nextel (NYSE: S) and AT&T (NYSE: T).

Out of those carriers, Sprint recently received the Best Buy Bravo! Award for outstanding vendor performance. Best Buy's presentation to 25 vendors across various categories included Sprint (the only wireless carrier) because of the company's contributions to the Best Buy's success. Considering that the Bravo! Award covers all things wireless -- from post-paid carriers, pay-and-go, wireless accessories and mobile virtual network operators (MVNO) like Virgin Mobile and Amp'd Mobile -- this is a pretty significant score for Sprint.

Sprint was recognized by Best Buy due to providing exclusive handsets to the retailer for sale as well as offering "instant upgrades" inside stores to encourage customers to sign longer contracts (and giving Best Buy a commission). Sprint Nextel is currently the third-largest wireless carrier in the U.S. behind AT&T and Verizon Wireless.

Best Buy (NYSE: BBY), the largest consumer electronics retailer in the U.S., will be launching 150 to 200 Best Buy Mobile wireless stores in its New York, Boston and Texas markets. The phase-in of these Mobile stores will occur over the next 18 months, according to the retailer.

Best Buy just keeps on singing a happy tune with its performance. Its retail stores are way ahead of competitors Circuit City Stores (NYSE: CC)and CompUSA in terms of profitability, its Best Buy for Business division is healthy, and it acquired Speakeasy to enter the computer services arena even further. The company just can't seem to do wrong these days.

Best Buy's latest effort in the wireless landscape will include freestanding locations branded as "Best Buy Mobile" and kiosks within Best Buy stores themselves. I'm left wondering how the in-store units will be different than the wireless departments already inside Best Buy stores, however.

The company states that the newer Mobile stores will feature an expanded assortment of handsets, accessories and services. Wireless operators that will be offered include Cingular, Sprint Nextel (NYSE: S) and Verizon Communications (NYSE: VZ). Mobile virtual network operators (MVNOs) and prepaid services including Amp'd Mobile, Boost Mobile, Cingular Go Phone, Verizon InPulse and Virgin Mobile will also be offered.