do i need booster for 2 land lines not in touch with router

[Hartley1]

 5 land line extensions 3 work and 2 don't. they all did with BT'

[Hartley1]

3 Land line phones are working. 2 Landline phones are not finding the router

[Mark39]

If you had phones for BT's Digital Voice service, they won't work with Sky. 

[Hartley1]

What do I have to do then? Do you supply some adapters?

[Hartley1]

What do I need to do to make my 2 phones work 

[Mark39]

If they're phones designed to work solely with BT's Digital Voice service, they won't work with Sky and you'll need to replace them. A standard, cordless analogue DECT phone might be a convenient soution, where the base unit plugs into your broadband Hub, and the phone handsets connect to it wirelessly.