One popular option is to get a local SIM card from a Japanese carrier. This way you can have a Japanese phone number and take advantage of local call and data rates. Some of the major operators in Japan include NTT Docomo, SoftBank, and KDDI. You may also consider renting a mobile device or portable Wi-Fi router if you'd like to keep your current phone number and use it in Japan.
These devices usually come with a Japanese phone chinese overseas america data number that you can use during your stay. Another option is to use international roaming with a carrier in your country, although this can be quite expensive. to or from Japan, it is important to know the country code and dialing instructions. To call a Japanese phone number from abroad, you need to dial Japan's country code (81), followed by the area code and the subscriber number.
Conversely, when calling other countries from Japan, you dial the international dialing prefix (010), then the country code, area code and the number of the subscriber. If you have a Japanese phone number and need to make international calls, be sure to check with your carrier for international calling rates and options. Some carriers offer international calling plans that can help you save money on long distance calls.