The key to saving money on your BT phone bill is to analyse where you actually spend the money!
The BT Phone Analyser developed by Daisy Analysis is a fully-functionation, easy-to-use program, that can view, sum, print and analyse the calls made using a fixed-line to BT.

Shown is the BT Phone Analyser whilst drawing a specialist Daisy Chart, which allows links and patterns of calls made to be ascertained.
When you use the BT Phone Analyser call charges are saved in several ways :-