Tier1 美国运营商

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来自mobilemarketingwatch的观点，美国Tier1运营商是：

AT&T
Verizon
Sprint
T-Mobile


All four of the aforementioned wireless carriers are tier-1 carriers, meaning they don’t borrow network capacity from anyone else.  These four tier-1 operators have been busy acquiring tier-2 and tier-3 carriers in an attempt to broaden its subscriber base, leaving very few independent tier-2 and 3 operators in the US.  An example of a tier-2 carrier in the US is U.S Cellular, who has an agreement in place with Sprint for voice and data coverage.


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