OpenSignal's bi-yearly carrier report for the US was just released, and T-Mobile's rampage from last year seems to be continuing. Although both Verizon and AT&T are seeing some recovery in network speed after the reintroduction of their unlimited plans last year, T-Mobile has again topped nearly every category in OpenSignal's testing. Sprint, though still in 4th overall, is also making great strides in both speed and availability.

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