How to solve the traffic of mobile phones to Japan?

The solution to this process is as follows:

1. Open international roaming: open international roaming to operators, and you can use mobile phone traffic normally after you arrive in Japan.

2. Buy a local calling card: Buy a local operator's calling card and network card on Taobao before departure. Some charge by the day, some by the flow. You can buy it according to your own needs and plug it into your mobile phone when you arrive in Japan.