2 of 2 people found this helpful
Sorry to hear that you're unable to add a South Korean credit card into your prepaid AutoPay system.
I'm going to assume that you live in the United States, and know your ZIP code?
Have you tried just adding it as a U.S. card? Usually that will work, as long as you have a ZIP code to go along with.
If all else fails, calling T-Mobile reps (611 on your T-Mobile phone) would be the smartest and fastest option.
Please let me know what happens!
Just checking in here to see if you still needed help with this. Please let us know.