2017年12月15日から050発信の国内携帯宛電話の通話料が
11.88円から14.58円/分(消費税込)に値上げ

ソースはメールのお知らせ。

Dear customer,
Thank you for using the 050 Free app.
We would like to inform you that, starting from December 15th (Friday)
2017, the rate for placing calls from the 050 Free app to mobile phones
in Japan will change to:
14.58 yen / 1 minute (consumption tax included)
Thank you for your understanding.
If you have any questions, please contact our Customer Service.
With regards,
Brastel - Customer Service
Toll-free:0120-659-534
From mobile phones:03-5637-5904
Mon.-Fri.: 9:30 to 21:00 / Sat.: 10:00 to 18:00
Closed on Sundays and national holidays.