Once you have a phone that will work locally, you will need a SIM card. SIM cards are tied to both a phone number and a provider, so choose carefully. They can be bought at any mobile phone shop, even at the airport, and the numbers will usually be offered on a large sign or list. Prices vary, largely depending on how lucky the number is considered, and range from ¥60 to ¥300. Don’t lose the small plastic card attached to the SIM card; it will be needed in case of loss or theft.