What should we do to do "communication failure" that we don't know when?(Real Sound) --Yahoo! News

From UNSPLASH

　It has been found that DOCOMO's large -scale communication failure in October 2021 influenced more than 8.3 million in data communication and about 4.6 million in voice calls. In this case, the Ministry of Internal Affairs and Communications provided administrative guidance to DOCOMO, and in response to this, docomo submitted a communication failure report on December 27. [Photo] No matter how much thorough countermeasures, the "sub -line" telecommunications carrier you want to use for communication failures, it is not realistic to make the outbreak "completely zero". It is possible that communication disorders will occur not only for docomo, but also for some reasons. We smartphone users need self -defense measures in preparation for such a situation. In this article, I would like to consider measures against communication failures that can be implemented without any hassle or cost as possible. As a countermeasure against communication disorders, the most secure thing is to subscribe to the "sub line" in advance. Depending on the smartphone model, it may support "dual SIM" that can use two lines for one terminal. In that case, you can use another line contract separately from the main line, and use it while switching as needed. Dual SIM -compatible terminals can use two SIM cards (physical SIMs), a type that can use ESIM in which a line contract information is written on the terminal, in addition to the physical SIM, can be used. There are types. For example, if you own a terminal that can use dual SIM in physical SIM + ESIM and use physical SIM on the current main line, you can sign up for the second line with a plan that supports ESIM. In that case, I would like to recommend a plan that can be used for "basic fee 0 yen". Specifically, KDDI's "POVO2"."0" and "Rakuten Mobile" are applicable.POVO2.0 has no concept of basic charge, and is a mechanism to purchase "toppings" such as data communication and calling unlimited calling as needed. There are five types of data communication toppings, 1GB to 150GB, which is cheaper. In addition, there is also a 330 yen "24 -hour unlimited use" topping suitable for one day only for one day. It is important to note that if you do not buy toppings for more than 180 days, the line will be stopped. I would like to purchase toppings regularly, such as using all -you -can -use toppings when working on the go. In Rakuten Mobile, communication up to 1GB per month is "0 yen". However, in this case, it is necessary to use the line regularly, as unused lines may be stopped or canceled for a certain period of time. In each case, the line can be maintained at a small amount, so if you can use dual SIM, we will definitely consider using it as an insurance in case of emergency. The problem is that you are using a smartphone that does not support dual SIM. In that case, if the main net line becomes unusable, you will rely on Wi-Fi. In case of emergency, it is safe to know where you can use the free Wi-Fi in stores and towns in your daily life area or in commuting routes. There is also an app called "Town Wi-Fi" as a tool that can easily search for free Wi-Fi near the current location. You can receive notifications or connect automatically when you find available Wi-Fi, so you can use it in your daily life to confirm the familiar free Wi-Fi. If you look at the fundamental part, it is also important to secure a minimum move and contact without relying on your smartphone. Until the spread of mobile phones, the sight of "contacting your home by public phone from the go" was not unusual, but it is rarely used in everyday life now. Therefore, even if you want to contact from a public phone in an emergency, you may not know the other party's phone number or have no coins for calling. Furthermore, if you use QR payments or touch payments using QR payments or touch payments, you can use physical transportation IC cards, credit cards, and banknotes for shopping. There may not be cases. If you get used to such a reliable smartphone, you will be at a loss when you have a communication failure on your way home and you have to return to your home without using a smartphone. I would also like to consider "analog measures" such as carrying cash and cash that is not difficult to travel to home to use public telephones, and put physical transportation IC cards and credit cards in a smartphone case.

Mariko Sakai