People buying shares in British Telecommunications Plc will be able to deal in shares by punching the keys on a normal push-button telephone: the retail investment company ShareLink Ltd said the service, the first such scheme in Europe, is being offered as part of the marketing campaign for BT3, the UK government’s sale of a third tranche of British Telecom shares, marketing of which began yesterday; the system will later be extended to cover other shares; the government’s remaining shares are to be sold in July; pricing and details of whether all the remaining 21.8% stake will be sold are due in June.