At the top of the reasons to invest in AT's (NYSE: T) stock is its juicy 7.9% dividend yield. However, many investors have been taught that they should proceed cautiously once a stock's dividend gets above a 5% to 6% yield. Normally, you see these yields on lesser-known businesses, but not on giants like AT

So, what's happening with AT, and should you avoid the stock? Read on to find out.

The dividend yield is a simple calculation: The annual dividend divided by the stock price. AT raised its dividend steadily for years, and its yield rose to more than 10% in late 2021. 

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Source Fool.com