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rootmetrics1If you’re living in Seattle, AT&T and Verizon will deliver the best overall mobile performance, T-Mobile is not far behind and Sprint is decent with the exception of poor data download speeds.

rootThose are the findings from Bellevue-based RootMetrics‘ fifth performance report, which ran 48,441 tests to analyze how the carriers compare in the Seattle region.

The company looked at three categories — data, call and text — and based on its scoring system, AT&T and Verizon tied for first with a score of 95 for combined performance. T-Mobile was third with 88 points, while Sprint finished last at 78.

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The data portion of the report was the most in-depth section. Having its LTE service launch in Seattle within the past year dramatically increased AT&T’s data performance, as it tied with Verizon for first place in this category (Verizon had won this portion for the past four test periods).

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On the flipside, not having LTE coverage in Seattle hurt Sprint and Bellevue-based T-Mobile USA, which has promised expansion of its new LTE network to the Emerald City by the end of 2013.

In terms of call performance, Verizon, AT&T and T-Mobile all tied for first with a score of 97, while Sprint was close with 94. The top three carriers all had call failure rates of 0.8 percent or below, which means that about 1 in 150 calls would drop or block. Sprint, meanwhile, had a 1.7 percent call failure rate.

Finally, in terms of texting, all carriers demonstrated excellent results, as Sprint and T-Mobile’s text delivery speed “improved significantly,” from last year’s test.

The data, which was collected indoors and outdoors via the RootScout app on Android phones, was recorded from May 10 — 16 of this year. See the full report and methodology here.

Previously on GeekWire: AT&T has the fastest LTE network (if you can access it)

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