Remember the dire warnings that Apple’s exclusive iPhone deal with AT&T would give the pair unprecedented market power? The jeremiahs are breathing easier now that Apple is apparently adding Verizon to the inner circle. But the market segment has long been more competitive than generally understood. Smartphones based on Google’s open Android platform, available on every major network, are selling like… smartphones. And Microsoft has just become a serious player, debuting its own well-reviewed open platform soon to be available on a slew of handsets on all the networks. Once again, rapid technological change trumps market power.