Tests are conducted with unmodified Android-based smartphones purchased off the shelf at regular mobile phone stores. The company tests mobile networks at various locations and hours, both indoors and outdoors, and while driving, using a random sampling methodology to prevent bias.

Test locations are randomly selected in each state and each nation, and divided into groups by population size, with each population-based group given equal weighting. Ĭomplementing its professional testing, the firm also gathers crowdsourced network performance data from mobile users, combining them to produce the CoverageMap comparison tool, available both online and within the mobile application. RootScore Awards are assigned to the networks with the top score in data/mobile internet performance, call performance, text performance, and overall performance incorporating the three categories. ^ 'AT&T Provides Best Coverage at Top U.S.^ 'So who has the superior wireless network, anyway?'.^ 'Root's Crowd Sourcing Launch Deemed A Success'.^ 'Infographic: Making sense of the spectrum debate'.^ 'Five things you didn't know about data testing (Smartphones Unlocked)'.^ 'Carphone Warehouse, RootMetrics team up to help Brits find the best network'.^ 'Root Metrics Measures Cell Service At Airports, Which Carrier Wins?'.^ 'Mobile speed tester RootMetrics expands to the UK'.^ 'Canada's wireless tops the U.S and U.K.^ 'EE named best UK mobile phone network, Three in second place'.^ 'RootMetrics Releases 2nd Half 2014 US Mobile Network Performance Review Verizon Maintains #1 Overall Ranking, Race Heating Up on Many Levels'.^ 'Meet the firm behind Verizon, AT&T's reliability, speed claims'.^ 'Which wireless carrier is king? One testing firm weighs in'.^ 'Shopping for a Mobile Network? Cut Through the Marketing with RootMetrics'.For airports the awards are based on the data/mobile internet performance.

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