Also, I always thought the reason why 900MHz carriers get worse reception is because the towers have less range (just what I was told by a guy in carphone warehouse over a decade ago, but reminiscent of something i learnt in school, and evidenced by anyone i've ever known on orange/one2one), so they need more of them than the 1800Mhz carriers do, and can't afford as good a network. I'd have thought something similar was true of 700MHz towers vs. the 1900 (?) MHz GSM towers in use in the States, meaning yet more costs for Apple/Google.