While this is a lot of money it's only about 10% of their yearly net income, a major hit of 25-40% would have been a major way to let them know this is not acceptable and the FCC means business. Of course with net neutrality they really can't pull this anymore can they?
It's basically a slap on the wrist
Being from the U.S. and having lived in different places around the world (China, Hong Kong, UK), I have to say that the US mobile phone situation is the worst. Fees are extraordinarily expensive compared to everywhere else, options are incredibly limited, and contracts are not the norm in any other country I've lived. This is clearly one of those situations where government regulation has failed and will continue to as long as the relationship between the FCC and government is not fixed.
I hope not, but we need to keep an eye on this and see where it is going.