I bought a plane ticket to Japan next week. Do I need to change my local calling card to play?

it is recommended to change a Japanese card! I traveled to Japan for 8 days last month, and I definitely have to come to a circle of friends contest with my friends to play. Four of our friends went together, and I rented a WIFI with another friend. Er, it's a little inconvenient to bring a WIFI egg, mainly because there is always no electricity, and it is still heavy. We have always disliked it. Going out for eight hours, six hours basically depends on rubbing my little sister's network. Haha, that little sister made a strategy before coming, and it is more cost-effective to get a mobile phone card. She prepared the Japanese data card of CMLink of China Mobile a week ago, and the internet speed was still ok. We went to see Ginza, the snowy top of Mount Fuji, visited Kyoto and ate Osaka all the way, and the internet speed was very stable after a trip. She also shared her day's trip with her parents in China at night, which really made her feel safe with such a friend ~ At that time, we didn't think it was necessary when she asked us to do it.