U.S. wireless carrier AT (NYSE: T) is a polarizing stock among investors. Shares are down nearly 30% in price over the past decade, which is a tough pill to swallow. However, include AT's famous high-yielding dividend and shares generated a 50% positive return.

Indeed, dividends can have a powerful impact on investment returns.

Moreso than returns, retirees depend on dividends for the passive income they offer, which can help pay living expenses. For those investors, a high dividend yield they can trust to continue coming quarter after quarter matters above all.

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Source Fool.com