My daughter has Tiscali,she has to rent her telephone line through BT and pays BT for it,her calls and internet are paid to Tiscali.She has no trouble with it.
I have a Tiscali package, I pay �23.99 monthly for broadband and free telephone calls to landlines 24/7, but pay BT �11.00 for the phone line too, the service is good, and they tell me that they will offer me free landline rental in another month or so for just �2, which would be great, but we'll see.....................