How to change payment methods for an iPhone Upgrade Program loan

What happens when you don't have an account number and need to change payment methods?
iphone 6s 6splus headphpne jack
Jason Snell

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Glenn Fleishman’s most recent books include Take Control of iOS & iPadOS Privacy and Security, Second Edition (covering iOS 15/iPadOS 15), Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.