Mobile phone
You can buy a SIM card for about ¥1,249.70, which includes 1 GB of data plan. You can choose from 4 telecoms: KDDI au, NTT DoCoMo, Rakuten Mobile or Softbank.
Mobile phones
Japan uses GSM mobile networks .
Roaming
If you don't want to buy SIM card in Japan upon arrival, make sure to check the roaming charges with your telecom provider before your departure so there are no surprises when you return home.