BT sold off its own mobile network a few years ago, so it buys airtime [5]from Vodafone.

因为英国电信早在前几年已经廉价出售了他自己的移动网络平台，所以他要从沃达丰公司购得漫游通话平台。

youdao

The day's other leading performers included BT - up 2.6% - and United Utilities, which rose 2.5% after an upgrade of the sector by Goldman Sachs and recent excitement surrounding the overseas bid interest in rival Severn Trent.

BBC: News - London shares reach 12-year high