Can I insert the SIM card into my phone outside of Japan first?

🅰️ Yes, it’s fine.
Since our company’s SIM card is a product from a Japanese telecom provider and not an international roaming type, it will not be activated when inserted into the phone outside of Japan, as it won’t be able to receive the docomo signal from Japan.
To avoid forgetting the SIM ejector tool when traveling abroad or accidentally losing the SIM card while out, we recommend inserting the SIM card into the phone ahead of time.
For dual-SIM phones, typically the SIM card you’re using is inserted in the SIM1 slot, so you can insert the Japanese SIM card into the SIM2 slot as a backup.
※The SIM card will display “No Service/Unknown Number”.