Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Turkish wireless giant Turkcell (NYSE: TKC) were dialed down by investors today, shedding as much as 12% after the company announced fourth-quarter results.

So what: Based on the share action, you might guess that earnings weren't what investors had expected … and you'd be right. For the quarter, the company earned 368 million Turkish lira, which was below the 437 million that analysts were looking for. Revenue for the quarter clocked in at 2.2 billion Turkish lira, down 3.3% from last year.

Now what: It's been a tough environment for this Motley Fool Income Investor pick as regulatory changes and aggressive competition have pressured the company. Investors may also be particularly skittish right now thanks to the recent upheaval in Egypt and unrest in Libya. After a less-than-wonderful 2010, Turkcell needs to prove itself to investors in the upcoming year. Giving investors good reason to hang around are the stock's forward price-to-earnings multiple below 10 and its 3.7% dividend yield.

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