noelster wrote on Jul 27
th, 2009 at 11:09pm:
But most importantly of all - Most companies have been moving away from 0870 to 0844 which are not included in the plan - why not ?
Welcome to the forum noelster.
All 0844/0845/0871 (and 0870 upto 31 July) are regulated such that BT only keeps a small proportion of retail call charges. The rest is passed to the telephone companies of the respective numbers. For example, 0844 477 numbers which are used by many NHS GPs are provided by Opal Telecom, part of Talk Talk, so it gets a huge slice of the call charges.
This regulation, known as the "NTS Condition" means that the outpayments are relative to BT's retail charges. So when BT varies its charges, the amount they get changes (they are subject to "revenue uncertainty") and so they often complain when this happens and their share goes down.
To address the revenue uncertainty on 0845 and 0870 ranges, 0844 and 0871 were introduced. The call rate from a BT landline is set by the telephone company that operates the respective range. So for 0844 477 numbers, it is Opal Telecom that specifies BT charges 5 pence per minute. They also specify whether to opt in or out of BT's discount schemes. Most choose to opt out.
With the NTS Condition applying on 0844/0871 numbers, the providers of these numbers can therefore control the amount of revenue they get.
So the question of why 0844 numbers remain as they are has nothing to do with BT. It is down to the providers of these numbers who operate them on behalf of their customers (companies, charities and public services).