It can be handy to know who's calling you before you decide to pick up the phone. Whether it's a number you don't recognise or you're busy with something more important, Caller Display shows you the number of the person calling, so you can decide whether to pick up or leave it to your answering service.

Existing BT Privacy with Caller Display customers can pre-register to get the service free for 12 months (a new 12 month line rental contract applies). Otherwise BT Privacy with Caller Display will cost £1.75 a month from January 4. The 12 month free product will continue to be available for sale after January 4.

Find out more and pre-register at bt.com/myfeatures.