DISASTER ALERT APPS

FOR NON-JAPANESE LIVING IN JAPAN
As soon as you arrive in Japan, you should be aware that she's a disaster prone country thus need to be prepared for calamities by being able to receive disaster alert, however it wouldn't be the case for most of you unless your mobile phone or tablet have already installed SIM card compatible with Japanese local mobile phones.
Nevertheless, here we present alternative solution. Those apps listed below DO NOT REQUIRE JAPANESE LOCAL SIM CARD. You can install them while you're still outside of Japan, come to the country directly, will be able to receive disaster alert that would probably save your life.