Instead, T-Mobile US Inc (NASDAQ:TMUS) outperformed the 4G and 3G networks of Verizon, AT&T and Sprint Corp (NYSE:S) across the board, sweeping the competition in terms of latency, download speed and coverage.

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The OpenSignal app data includes 5 billion measurements taken by 172,919 U.S. mobile devices from March 31 to June 29. The data clearly shows that new unlimited data plans from Verizon and AT&T have weighed on their network speeds.

Bogged Down By Data

“Our measured average speeds on Verizon and AT&T's networks have clearly dropped, almost certainly a result of new unlimited customers ramping up their data usage,” OpenSignal wrote in its report.

T-Mobile was the clear victor in terms of download speed, averaging 17.45 Mbps. Verizon (14.91 Mbps) was a distant second followed by AT&T (12.92 Mbps) and Sprint (9.76 Mbps).

When You Need It, Where You Need It

Finally, T-Mobile also came out on top with the lowest latency of all the networks. Latency is a measure of how long it takes for data to make a round-trip through the network. T-Mobile’s 4G network latency averaged just 62.84 ms, topping AT&T (63.81 ms), Verizon (67.38 ms) and Sprint (70.1 ms).

Stock Market-Approved

T-Mobile’s share price has mirrored its improving network status. In the past three years, T-Mobile’s stock is up 90.7 percent. In that time, Sprint shares are up 16.7 percent AT&T stock is up 8.4 percent, and Verizon stock is down 2.7 percent.