Overview

KooPhone provides yearly/monthly and pay-per-use billing modes.

Yearly/Monthly is a prepaid mode. You need to pay first, and will be billed yearly/monthly for your subscription duration. This mode is useful for long-term, stable services.
Pay-per-use is a postpaid mode. You use the service first, and will be billed afterwards for your usage duration. The fees are calculated in seconds and billed by the hour. The billing starts when the KooPhone instance is created. This billing mode allows you to flexibly adjust your resource usage. You do not need to provision resources in advance, or have excessive or insufficient resources preset. This mode is useful for traffic bursts.

Table 1 compares the two billing modes.

**Table 1** Billing modes
Billing Mode	Yearly/Monthly	Pay-per-Use
Payment mode	Prepaid. Billed on your subscription duration.	Postpaid. Billed on your usage duration. The billing starts when the KooPhone instance is created.
Billing cycle	Billed on your subscription duration.	Calculated in seconds and billed by the hour.
Billing item	Instance specifications, number of instances, and subscription duration.	Instance specifications, number of instances, and usage duration.
Billing for stopped resources	Billed on your subscription duration. Stopping instances has no effect on billing.	Delete cloud phones to stop billing. They are still billed if only stopped.
Billing mode change	Not supported.	Not supported.
Specification change	Not supported.	Not supported.
Application scenario	Useful for predictable and long-term usage.	Useful when you want more flexibility and control over compute resource usage.