If you have voicemail switched off on your Id Mobile number, then when someone calls you the phone rings for some time and the caller hears the ringing tone as you would expect. Eventually, if the call is not answered it stops ringing, as you would expect, but the caller then gets the recorded message:
“Sorry your service does not allow access to this number”
This is a rather concerning message for the caller because it suggests that there is some fundamental technical problem in calling your number whereas, in fact, there is no technical problem - the phone did ring but was not answered.
Is there any way of avoiding this worrying message being played to callers?
I am assuming that the actual voice message “Sorry your service does not allow access to this number” is generated by the calling network but that it is played because of some error response sent to it by the Id Mobile network because you don’t get this message when ringing phones on other networks (typically when ringing phones on other networks you get the ringing sound eventually followed a continuous tone if the call is not answered).