I think the OP is somewhat missing the point, without a landline phone it’s pretty difficult to establish the basics, do you have a dialtone at the master socket test port....obviously it’s anyone’s decision to have one or use one , but it’s pretty clear , given they can be had for such a small amount of money , ( £10 ) a cheap corded landline phone , even if it’s usually kept in a drawer, is worthwhile .
Anyway , you can report a fault anyway, it’s when you get to the point of accepting the possibility of charges if the problem either doesn’t exist or isn’t in anything Openreach are responsible for, you have to accept you are aware of this possibility ( checking for dialtone normally gives peace of mind , no dialtone at the test socket , must be an Openreach fault ) the other exception is ‘damage’ , if there is no dialtone at the test socket and that’s because the wire into the socket was chewed by the dog ,for example, then that’s chargeable too.
Your stats do indicate a problem , if you had a phone it would be easily demonstrated to the engineer if you had no dialtone , but all you can do is re-report the issue...usually when a fault is ‘cleared’ , you get a message stating the line is now OK, but if it isn’t to contact them , presumably you didn’t respond to these messages on your previous fault reports .
If you report a broadband issue and the underlying issue is actually not broadband as such but the line that carry’s the broadband service , reporting the telephony service rather than broadband may be better as the engineer who attends may be the correct type of engineer for landline faults.
