You can request a JCPenney Credit Card credit limit increment on the internet by accessing your account or through the phone number (800) 542-0800. The company will also regularly check your account to determine whether you're eligible to receive one. The best chance of getting an increase is if you've paid your bills on time and punctually. It can also increase your credit score and your income since opening the account. Don't ask for an increase every time However, it can result in a severe pull and can hurt your score over a brief time.