On 28 June 1995, BT introduced one of the most radical changes to its pricing structure in 50 years - per second pricing.

After investing £20 billion in the network and spending a further £70 million on computer equipment, BT was the first major network operator in the world to abolish unit charging immediately for all its customers.

Today customers pay for the exact time they use, whether they are calling a number in the UK or abroad. Weekend local rate calls cost just a penny a minute* and all calls are subject to a minimum charge of 5p.

*Excluding BT public payphones and BT Chargecard calls.