I am receiving a large number of nuisance and scam phone calls. My friend has call guard on her BT line and I wondered if it was something I could have on my virgin line?
If not how do I go about changing my landline number?
Have a look at this topic which is recent
which are very similar to your query.
You are probably best off, in the long run, buying your own call blocking and screening device as explained in the above topics.
Post back if you have further questions and will try to help answer them.