A few companies haven't, and not the fly-by-night operations you'd expect to operate outside the law. Big names like ADT, Ameriquest and others have recently earned the ire of the FTC for failing to comply and as a result the FTC divied out $7.7 million in fines. For such a young system, it's actually surprising the FTC has moved this fast. Obviously being targeted by telemarketers on your cell is a lot more intrusive than most forms of advertisement so it gets people heated up quite quickly.
The FTC maintains a complaint form for people to report companies abusing the list.