Why can I only call 2 other sky contacts via message app and not via phone or contacts app today

[Ka20]

This week when I try to call both parents my phone is silent and they are able to answer but I'm not aware.

The only way I can call them and hear dialling tone is via the message app instead of the usual phone or contacts app

[caesarome]

Have you checked your phone's settings to make sure that the call is not muted if such an option exists ?

[Ka20]

Thanks I've tried that and everything else.

It's related to call forwarding setting I think but when I try to disable it goes back to enabled again and says operator does not support disabling of call forwarding