What is the transfer number of Guangdong Mobile's incoming call reminder?

Incoming call reminder is a service that sends the missed phone number to the customer in the form of short message when the customer is turned off or out of service area.

Function fee: 3 yuan/month (charged by the day)

Communication fee: the caller is reminded that there is no charge for the successful call, but the customer calls the special IVR number/kloc-0 13800XXX309 to charge the normal call fee.

(Note: XXX is the long-distance area code where the mobile phone belongs. For example, Guangdong Mobile users can set the call forwarding number as 13800020309).

I don't know if the explanation is clear, thank you!