[grace-baker Hexnode 28 January 2020 grace-baker Moderator]

Hey, Thanks for reaching out to us.

You can block outgoing calls on Android devices using Hexnode MDM.
Please navigate to Android->Advanced Restrictions->Allow Device Functionality. Disable the ‘Make a call’ option. This will prevent the users from initiating calls on their devices.

Kindly use the help link for more info on the restrictions in Android.

Cheers!
Grace Baker
Hexnode MDM