BT is inviting more people than ever to join in a conference call via their mobile phones.

Upping the number of people who can communicate simultaneously from six to 20, its Group Chat service has been designed to help people co-ordinate meetings and large group events such as hen and stag nights.

Instead of needing to make numerous individual calls to each person, repeating the same information to each one, Group Chat users can make all the arrangements via one large-scale conference call.

BT claims that the service is more straightforward than competitive offerings because the 'chairperson', who instigates the call, does not also need to originate the calls of each participant. Instead, individuals dial in using the chairperson's number as a pin. It works no matter which network the mobile phone users are hooked up to, as long as the chairperson is a BT Cellnet subscriber.