“Last week, an order from the Federal Communications Commission that caps rates for United States prison telephone calls went into effect. A late stay by a federal appeals court, sought by phone companies suing the F.C.C., had threatened to delay the order’s implementation. The stay affects several portions of the F.C.C.’s regulation, but key rate caps and restrictions on charges now apply — to the delight of advocates for prisoners and their families who have long criticized the call rates as a form of price gouging.”