Most or all credit card contracts pretty much state that the company can change the terms whenever they want, which means sooner or later they will fuck over anyone who doesn't pay off the balance every month. Even the people with no missed bills and a good credit score. The people who pay off the balance every month are referred to in the industry as "deadbeats". That should tell you all you need to know about the credit industry. They are all a bunch of fucking thieves.
If, for some reason, you need to have a credit card, go through a credit union. If you have a credit card through a regular bank, transfer that balance to a card issued from a credit union. If you have a regular bank account, switch to a credit union. Credit unions tend to have less incentive to rip you off and fuck you over than a normal bank, and generally have smaller fees and better terms across the board. Unless you are middle class or higher, you can't win with a normal bank. They are designed to fuck poor people out of money they don't have or desperately need.
Here's some info every should know before they get a credit card.
http://www.pbs.org/wgbh/pages/frontline/shows/credit/
Fuck them all with a gigantic bag of rotting dicks.
Credit Cards
71“As I have said before, the ever more sophisticated weapons piling up in the arsenals of the wealthiest and the mightiest can kill the illiterate, the ill, the poor and the hungry, but they cannot kill ignorance, illness, poverty or hunger.”