You can exchange phone bills at China Construction Bank Mobile Banking. The specific method is as follows:

1. Log in to China Construction Bank Mobile Banking or official website, and enter the credit card points redemption page.

2. Select "Call Charge Exchange" as the exchange method, and enter the amount to be exchanged. China Construction Bank will generally stipulate the minimum exchange amount, so please ensure that the input amount meets the requirements.

3. Confirm the exchange of information and submit the application. Before submitting the application, please carefully check whether the exchange amount and contact information are accurate.

4. Waiting for review. China Construction Bank will review the application for exchange, usually within a few working days.

5. After successful exchange, CCB will recharge the corresponding phone bill to the mobile phone number. You can check the recharge balance through SMS or mobile banking.