The Free On-line Dictionary of Computing (30 December 2018):

British Telecom

    (BT) The largest telecommunications provider in the
   UK.

   Due to regulatory issues, BT had to sell off its interest in
   McCaw Cellular.  BT sold it to AT&T for something like 4B$.
   BT then invested that in MCI.  As a part of the deal, MCI
   was given BT North America, which was the old Tymnet.  MCI
   laid off about 40% of the Tymnet staff.

   (http://intervid.co.uk/).

   (1995-05-09)