Update 19/08/23
They market Digital Voice add-on as including calls to UK mobiles. This is not true and they don't seem to know exactly what they are offering. This first came to light when I was charged for a call to a Sky mobile for which they refunded me. They then told me that calls to MVNO (Virtual Network Operator) numbers are not included in the bundle but this is not true as most of the people we call are on Giff-Gaff & Lebara. I asked for a proper explanation of the situation on 4th August and have yet to receive even an acknowledgment.
Very disappointing.

8/2/23
Connection and speed are great.
Tech' Support folks are knowledgeable and efficient.
Very responsive to comments on here too. ;-) :-D