MCI Communications Corp, which has so far been much more restrained in its reaction to AT&T Co’s acute telephonic embarrassment on Martin Luther King Day that US Sprint Communications – no doubt on the basis that those that live in glass fibre optic houses shouldn’t throw brickbats nevertheless expects its share of the long-distance market to grow another couple of percentage points on top of the two points or so it reckons it put on in 1989 to reach a 12% share of the $55,000m a year market: it estimates that AT&T’s share of the market is now down to about 70%, compared with as much as 96% before it divested the seven regional Bells.