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.