Hi fma2112,
Thank you for trying.
This is a limitation of MagiCall. It cannot add Network commands when changing outgoing number.
Let me explain my answer. *31# is a network command but a real phone number. Such commands must be sent first prior to dial the real number. That means, when you dial *31#+331234567890 with phone pad, the phone application recognize *31# and send a command to network before dialing +331234567890. And MagiCall only get notified when the phone app begin to dial +331234567890 and at this time the call is in process, so it is impossible to send network command anymore.
Here is the short answer, MagiCall is not able to add *XX# in front of an outgoing number because of a limitation.
