Where do those cell phone bills go?

There's a recent story out where Michelle took time to do her volunteer work in DC. She showed up "unexpectedly" at a homeless shelter with food donated by the White House staff. The photo with the picture of her serving food also shows the food recipient taking a photo of Michelle with a cell phone.

Doesn't this make you scratch your head? First, why does the White House staff donate the only food mentioned in the story? Doesn't Michelle and her hubby make enough money to donate as well? Second, where does the cell phone bill get delivered to the homeless person in DC?