Since the iPhone’s launch in mid-2007, AT&T has been roundly criticized for poor network performance, both with dropped calls, and slow data speeds. Is it AT&T’s fault? Or, are network problems caused by the iPhone? Colin Gibbs on GigaOm:

AT&T isn’t the only operator whose network shortcomings have been exposed by data-hungry iPhone users. O2 — which until recently was the only UK operator to carry Apple’s gadget — said it will spend $166 million over the next several months to shore up its network to meet ever-increasing demands from smartphone users. Additionally, the carrier said it will build 40 new cell sites in and around London in advance of the holiday season.

It’s the iPhone phenomenon.