AT&T[]
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Verizon[]
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Sprint[]
Sprint is bad, and all Sprint users should feel bad. Their ancient CDMA2000 3G network is slower than even AT&T's EDGE 2G network, and their tiny 4G LTE network exists in roughly 30 markets nationwide, compared with 100 for AT&T and 400 for Verizon. If you really need unlimited data, go with the $30/month T-Mobile no contract plan.
T-Mobile[]
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Regional and MVNO[]
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Contractless/Prepaid []
Sauce: http://forum.xda-developers.com/showthread.php?t=1455014