You can wait until the 1st day of next month for the data amount to renew itself, or you can purchase additional recharge payment to unlock voice call limited service.
To unlock the *Voice Call Limit Service*, please follow to these instructions:
- Log in to *My Page* https://user.jpmob.jp/users/sign_in
- Product details
- Using products > Data Usage Recharge
- Choose "Recharge Voice Call Usage: 2000 Yen"
- You will Finish additional payment by
- Use your designated payment method to complete the payment.
Voice call function will be unlocked for your account right after you finished your additional payment.