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Here is a list of US Cell Phone Carriers and how you should feeel about them
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.