KDDI and Softbank will introduce a service that allows users to use both communication lines with one smartphone from the end of next month so that users can make calls even if communication failure occurs.

In July of last year, KDDI experienced a large-scale communication failure that lasted for more than two and a half days.

For this reason, KDDI and Softbank have decided to introduce a new plan that allows both communication lines to be used as backup lines in the event of a communication failure or disaster.

Both companies want to keep the basic monthly fee low by using a mechanism called "dual SIM" that allows you to use the lines of two companies with one smartphone.

The service is scheduled to be provided from the end of next month, and the two companies are discussing whether it is possible to introduce a similar mechanism with other mobile companies.

The Ministry of Internal Affairs and Communications is discussing the introduction of "roaming," which allows the use of other companies' communication networks in the event of a communication failure. It is a form that started to correspond to.