What is gap customer service phone number? Gap customer service number for U.S -> 800-427-7895 (Toll free) (Get support for general questions and more) Gap customer service number from Outside the U.S -> 614-744-3907.How do i pay my gap bill online? Here’s how to do it: Use your Gap credit card login information to access your Gap online account at the Gap website. Click on the “Pay Your Bill” option once you are logged in to pay online. Select the amount you want to pay. Allow up to a week to process your first online payment.What is a gap store card? The Gap card is a Store-rewards card, which usually offers discounts on specific brand merchandises. The Gap credit card is issued by GE Money to inpiduals who have a fair credit history.