Warren Buffett had to work from his iPhone for days after lines went down at Berkshire Hathaway

Getty Images / Bill Pugliano

• Warren Buffett slashed his Apple stake then found himself forced to work from his iPhone.
• The investor turned to the device after phone lines went down this week at Berkshire Hathaway HQ.
• "I'm glad we didn't sell all of our Apple," Buffett joked to The Omaha World-Herald.

Warren Buffett may be cursing the universe for its wicked sense of humor.

The famed investor revealed during Berkshire Hathaway's annual...