To use it, you feed it a copy of one of your itemised phone bills as a plain text file in a very simple format, together with a tariff file for the tariff you're currently being charged on, and a tariff file for each tariff which you're considering switching to. It will then recalculate your entire bill for each of the tariffs you're considering switching to, so you can see whether you would have saved money by being on that tariff instead. Features Fairly complete understanding of the monthly line rental systems of the four major UK mobile phone networks.
Classifies calls using pseudo-code defined in the configuration file.
Support for initial network connection and monthly line rental fees. Support for a certain number of minutes of free calls per month for certain calls categories. Optional minimum call length feature. Can sort calls by category or by time, or both. As I wrote it mainly for me, it's currently geared towards UK mobile phone network tariffs with monthly line rentals.