I found Orange to have a better 3G network and T-Mobile to have a better 2G network... but I doubt you live next to me so it could be completely different wherever you are! (I'm talking real world usage, not coverage maps)
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iPhone 5 (iOS 6.0.1), iPad 2 (iOS 6.0.1), Nexus 7 (Android 4.2 Jelly Bean)
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