If there have been two lines before, the problem is which physical one will be used.
One will be connected through one of the two original masters to the third one the previous people used. The other will go to the other master. Unless someone has done some really esoteric wiring.
How is she going to have Sky calls if she isn't having a Sky landline? Are they letting her have the line rental with someone else for some reason?
Or do you just mean she isn't having a physical landline phone to plug in anywhere? If so, it is a very good idea to get a cheap corded one from Argos, Maplin, B & Q or wherever - typically under £7, and stick it in a cupboard out of the way. For diagnostics now or in the future if there is ever a problem.
Re which to use, back to my earlier post as well as this one. We don't know what socket(s) will be live. So nobody can advise.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
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