Basically it's extortion.
Here's something that congress should do. Telecom companies are government-granted monopolies. Why not acknowledge that it's already not a free market situation and cap the profit margin that these companies are allowed to operate at (like they're doing with health insurance now)?
It's insane that 5GB bandwidth/month is $50. It's insane that text messages are so expensive. It's insane that the fee to enter into a new 2-year discounted phone contract isn't proportional to the amount of money the company has recouped on the original phone.