4G is here - and it seems like all four of America's biggest carriers are more than happy to advertise the fact that they've got it. Sprint was first on the scene - offering their WiMax 4G, and T-Mobile shortly thereafter began its upgrade to HSPA+ technology. Verizon was next, providing mobile broadband LTE via USB dongle for laptops, though its much-awaited debut 4G handset, the Thunderbolt, has yet to hit shelves after numerous delays.

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