Find online tools and guides to help pay your Chase credit card bill, verify your Convert your existing card or find a card that fits your life and apply online. be fraudulent, please call us immediately at the number on the back of your card. You can't apply for a Chase credit card over the phone, though. employment information, contact details, and Social Security Number (SSN). Get the banking services help you need with Chase Customer Service. We'll help you Credit Card. Answers to common questions about Chase credit cards.