5. Can I use JP SMART SIM in other countries out of Japan? May 26, 2020 07:32 Updated Unfortunately not. JP SMART SIM is only useable within Japan. Also, data-roaming is not available regarding this matter. Related articles 1. What is the documentation requirement of applying for JP SMART SIM? 4. Is there any smartphone including in the plan? 1. How long does it take for the delivery? 1. What size of SIM card should I select? 2. What is the Compatible Device of JP Smart Sim?