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1. First enter the mobile phone and click My Options, as shown in the figure below.

2. Then, in the personal center page that opens, click the customer service center option below.

3. Then, in the customer service center page that opens, select the consultation type.

4. Finally, contact customer service, and you can see the entrance of installment, or the reason why installment can't be used may be that the goods don't support installment, or the installment amount is not enough.

Definition of installment payment:

Installment payment refers to selecting the number of periods when paying the transaction, then paying the transaction amount in one lump sum with credit products such as credit cards or flower buds, and then repaying the consumption amount and the corresponding installment fee in installments according to the number of periods selected at the time of payment.

Generally, installment payment has certain requirements for the transaction amount. For example, Industrial and Commercial Bank of China stipulates that a single credit card transaction amount must reach RMB 100 or equivalent foreign currency before installment payment can be made. Transactions with an amount less than 100 cannot be phased naturally.

The antonym of installment is bill installment. The so-called "bill installment" means that after customers use credit products such as credit cards or flower buds to make purchases, they can apply for installment before the repayment date, select a good number of installments, and repay the bill amount in installments.