See my blog on student credit cards
Some customers got their interest rates lowered by half. That is a considerable reduction, especially if you have the kind of interest rates associated with a credit card for bad credit. When the credit card company considers your request for a lower interest rate, your credit rating and the length of time you have been with that particular company will be two of the top factors they will look at. If your credit rating is poor, emphasize how long you have been the company's customer, how you have regularly paid your bills by the due date, and the small percentage of your credit line you are currently using, since these are other important factors that the credit card company will take into account. So phone to ask your credit card company for a better interest rate, and be polite but persistent.