Travel to Japan, mobile card, mobile phone is Huawei x5, can it be used in Japan?

No problem. Basically, except the customized version of China Mobile's mobile phone network standard is different from that of Japan, all other mobile phones can be used as long as they are not special. Just open a short roaming directly, valid for 30 days. Departure (China) takes effect automatically. After returning to China, it will be automatically transferred back to the domestic line and will automatically become invalid after 30 days. Personally, if you don't have to call, you don't have to roam or call. International roaming charges are still relatively expensive. Rent a mobile wifi. If you need anything, just contact WeChat and qq. Roaming is only an emergency in special circumstances.