RadioShack Corp.'s fourth-quarter earnings surged 26% as the retailer's stronger emphasis on cellphones resonated with consumers. However, the company's shares were down 4.5% at $19.70 in after-hours trading on the New York Stock Exchange. The stock is up about 80% over the past year. After years of working to stay relevant in a marketplace dominated by big-box retailers like Best Buy Co. and Wal-Mart Stores Inc., RadioShack is scoring with a wider selection of wireless phones, including Apple Inc.'s iPhone. Lately, the company has relaunched its brand as "The Shack" to get consumers thinking again about a retailer many remember as the place that required shoppers to give up their phone numbers to buy batteries. RadioShack reported a quarterly profit of $75.7 million, or 60 cents a share, compared with $60.1 million, or 48 cents a share, a year earlier. Revenue increased 4.7% to $1.32 billion as same-store sales rose 6.1% at company-operated stores and kiosks. The increase in comparable same-store sales was driven by higher Sprint Nextel Corp.[Read more...]