How to turn off the minutes of voice call opened by Unicom mobile phone?

Voice call function is the default function of mobile phone card and cannot be turned off. If you need to reduce the minutes in the mobile phone package, the existing Unicom mobile phone package is not suitable for use now. It is suggested to call the Unicom customer service hotline 100 10, which belongs to the mobile phone card, for consultation, so as to see if another more suitable mobile phone package can be replaced.