🅰️ Yes, it is possible!
Even when you are overseas (such as Taiwan), you can complete the verification by using international roaming to make a call to the Japanese phone number.

How to dial:
・Enter “+81” (Japan country code)
・Remove the first “0” from the phone number

Example:
050-1234-5678
➡️ +81 50-1234-5678

✅ When verification is successful, the call usually rings for 1–3 times and then automatically disconnects. The verification page will also proceed to the next step.

💰 Calls made from overseas to Japan may incur international roaming call charges according to your mobile carrier’s rates.

⚠️ If verification cannot be completed, please check the following:
・Make sure +81 is entered correctly
・Make sure the initial 0 has been removed from the phone number
・Confirm that your smartphone supports international calling and VoLTE functionality