Carrier status check
To Network unlock a phone under our SoftBank Network unlock service the phone must be clean, used on SoftBank for 100 days or more, and must be newer than 2016.
For more details see Softbank Unlock service
For inside Japan
https://ct11.my.softbank.jp/WBF/icv
This is a IMEI Check for Softbank. You well get a result as 〇 (Clean) , △ (Unpaid) × (Blacklisted) or – (Not found / Not Softbank)
If the results show:
〇 or △ : it is Supported to apply for unlocking
