I want to travel to Japan. How can I call China from Japan? What should I pay attention to, such as how much money to bring?

If the landlord uses a domestic number and has already started international roaming, then call the domestic/peer people? :? +86

Call the Japanese? :? Dial the phone number directly without adding the country number.

As for how much money to bring, it depends on whether the landlord swipes the card, which scenic spots to visit, and transportation expenses (transportation expenses in Japan are more expensive).