Direct configuration of Call Forwarding for VoLTE users based on GSMA Interface, if it is implemented by your Network Operator.
You may configure different divert rules, based on: always, not reachable, busy or not replying. Each condition may divert to a different phone number.
Additionally you may change the waiting time for "not replying" condition from 5 up to 180 seconds.
This app is tested on the Network of:
Deutsche Telekom (D1 / T-Mobile Germany)
but may work on different networks, if operator has implemented the needed GSMA Interface.
Not functional in following Networks:
Congstar (Germany on D1 Network, but no VoLTE as of 08/2018)
Unspecific Feedback - working:
Unspecific Feedback - NOT working:
India and United Kingdom.
Additionally this apps need a mobile data connection, to reach the GSMA Interface.