Try calling from another phone directly to your mobile. If you can’t reach your mobile phone, there is something wrong with your phone or the mobile network.
If you can reach your mobile phone, check in the MiniVoice app in settings/user details that your phone number is correct. If the number is wrong, contact the administrator to change the number.
There are settings in the response group that manage user availability, pauses between calls search options among group members, etc. These factors may be preventing calls from reaching you. Contact your administrator or the MiniVoice team to check these settings.