Coupons cannot be used when using Direct Carrier Billing payment, which will result in payment failure
Applicable products：
Tablet，Smartphone
Applicable products：
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If you are unable to pay due to the use of coupons when paying for the Direct Carrier Billing, you can do the following:
1. Change the payment method to continue the payment.
2. Do not choose to use coupons when using Direct Carrier Billing payment.
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