Do I need to configure a data transfer plan after I purchase it?

No, you do not need to configure a data transfer plan after you purchase it.

After you purchase a data transfer plan, it automatically offsets the IPv4 data transfer fees for the following resources: Elastic Compute Service (ECS) instances, elastic IP addresses (EIPs), Classic Load Balancer (CLB) instances, and EIP bandwidth plans that are billed on a pay-by-data-transfer basis.

Do data transfer plans affect the peak bandwidth of cloud services?

No, data transfer plans do not affect the peak bandwidth of cloud services.

Are data transfer plans applied based on the purchase date?

No, data transfer plans are applied based on the expiration date.

The data transfer plan with the earliest expiration date is first used to offset data transfer fees. For example, you have purchased two data transfer plans. One of the data transfer plans will expire on June 1, 2021. The other one will expire on February 1, 2021. The data transfer plan that will expire on February 1, 2021 is first used to offset data transfer fees.
Note However, if the expiration dates of the two data transfer plans are the same, the data transfer plan that is purchased earlier is first used to offset data transfer fees.

Can I use a data transfer plan to offset the data transfer fees for cloud services in regions that are not displayed on the buy page?

No, you cannot use a data transfer plan to offset the data transfer fees for cloud services in regions that are not displayed on the buy page.

You can view regions that support data transfer plans on the buy page.

Can I use a data transfer plan to offset the fees for cloud services that are billed on a pay-by-bandwidth basis?

No, you cannot use a data transfer plan to offset the fees for cloud services that are billed on a pay-by-bandwidth basis.

Data transfer plans apply only to ECS instances, EIPs, CLB instances, and EIP bandwidth plans that use IPv4 and are billed on a pay-by-data-transfer basis.