By Drew FitzGerald And Michael Calia 

Best Buy Co. said sales grew at the fastest rate in four years, helped by a more disciplined approach to discounting, greater investment by suppliers in its stores and strong demand for the new iPhone.

The unexpected sales gain makes Best Buy the latest big-box retailer to report better-than-expected revenue in the months leading up to November, suggesting that constraints on consumer spending may be easing slightly. But like Target Corp. and Wal-Mart Stores Inc., which also posted surprise sales gains, shopper traffic to Best Buy fell in the quarter.

"We've had a more favorable environment and then candidly we've gained share," Best Buy Chief Executive Hubert Joly said in an interview. "This is encouraging for the country as a whole."

Best Buy is in the midst of a turnaround plan put in place by Mr. Joly, who joined the retailer two years ago as its sales were being ravaged by cheaper online competitors. The company has invested heavily in its website and has leaned on suppliers to help finance improvements to the chain's 1,400 stores to try to attract more shoppers to come in and splurge on its growing inventory of items priced below $100, such as mobile phone and tablet accessories.

Sales at stores open at least 14 months grew 2.2%, the chain's biggest quarterly gain since the start of 2010. Best Buy's overall profit for the three months through Nov. 1 nearly doubled to $107 million from a year earlier. Revenue nudged higher to $9.38 billion.

The improved performance pushed shares of Best Buy up 7.7% to $38.29 midday Thursday, topping the level they reached in January, before the company reported an unexpected sales slump over last year's holiday season.

Looking ahead to heavy discounting during this year's holiday shopping season, Best Buy executives warned that fourth-quarter sales would be flat.

"The promotional environment is very intense," Mr. Joly said during a conference call. "It is certainly not less intensive, and if anything it's probably a little bit more intense than last year."

In the third quarter, the company said it took a more considered approach to marketing and discounts. It is trying to use a more targeted approach to online marketing sending consumers personalized marketing offers, which helped boost domestic online sales by 22%, though they only account for about 7.5% of total revenue.

The company noted that its electronics sales outperformed the industry average as calculated by market researcher NPD Group which found overall sales of consumer electronics slipped over the same period. The NPD figures don't include mobile phones or videogame products, two categories that Best Buy said it sold especially well during the quarter.

Best Buy also got a boost from selling installment-billing plans for mobile phones, the value of which the company could recognize upfront. The company sold more profitable products like smartphone cases than it did last year, partly because the chain's suppliers invested in sleeker mini-stores that showcase brands like Apple Inc., Samsung Electronics Co. and Sony Corp.

Many of those brands picked up the tab to train and staff those stores, allowing Best Buy to approach more shoppers without boosting its own expenses. Mr. Joly is in the process of cutting annual costs by as much as $1 billion. In the most recent period, the company increased its yearly cost savings from its initiative by $65 million to $965 million.

Write to Drew FitzGerald at andrew.fitzgerald@wsj.com and Michael Calia at michael.calia@wsj.com

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