地址簿备份是免费的吗？还是用户需要按月付费？

Is a phone's address book backed up free of charge, or do users pay a monthly fee?

youdao

相对的，一个依赖订户的公司，只要关心订户是否按月付费。

A firm that relies on subscriptions, by contrast, CARES only whether its consumers pay their monthly bills.

youdao

客户可以按月付费移除广告，也可以安装在iPhone或其它移动电话上。

Customers can pay a monthly fee to get rid of the advertisements or to install the application on iPhones and other mobile devices.

youdao