MYLINE

What is MYLINE?
MYLINE is a carrier registration service that allows you to make a call with your registered company without dialing the identification code of the company (e.g. 0077, 001 for KDDI) by registering the telephone company prior to use. You can get more discounts on calling rates by using "MYLINE (KDDI)" and an au mobile phone.
au Combined Line (in Japanese only)
Calling is made easy by registering for KDDI 
2 types of MYLINE services
There are 2 types of MYLINE services: "MYLINE" which enables users to select a telecommunication carrier, while "MYLINE PLUS" with a fixed telecommunication carrier. Telecommunication carrier can be selected for each of four calling areas: local, in-prefecture long distance, out-of-prefecture long distance and international calls
- MYLINE PLUS
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Recommended for customers who would like to always use KDDI!
KDDI's discount services are available even if you are using a non-KDDI phone device with an ACR function [2]. Register now. In cases where the registered phone service is not available due to disasters or other reasons, you can dial "122" (service cancellation number) before dialing a carrier's prefix code to use other phone services that are not registered for MYLINE PLUS.
- MYLINE
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One registration is completed,easy to make calls with no need to dial a prefix code!
Once KDDI is registered for MYLINE, you are no longer required to dial a prefix code "0077" or "001" to use KDDI's phone services. If you are using a phone device with an ACR function [2], a telecommunication carrier will be selected by the phone device regardless of which carrier you have registered for MYLINE. Besides, if you dial a prefix code for a carrier other than KDDI, this carrier will be given priority.
Save on calling charges for calls to mobile phones!
You can save on calling charges for calls made from a general subscriber phone at home to a mobile phone or PHS. If you have registered to KDDI's discount services, you can get more discounts when making a call to au mobile phone with the "0077" prefix.