By Ian Bush

PHILADELPHIA (CBS) – One mobile network has sped far ahead of others in Philadelphia, according to a new report.

T-Mobile notches an average 4G speed in the city of nearly 22.5 Megabits per second. Over the next-fastest network here, AT&T, that would save you about second when downloading a song but 10 minutes for a movie.

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“In Philadelphia, T-Mobile has put up very impressive speeds there. Higher than its national average, and it’s got a pretty strong lead there.”

Brendan Gill is CEO of OpenSignal, which crowdsources data on mobile network performance in the real world. Why might T-Mobile be tops?

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“They’ve invested heavily. They’ve had a lot of this 700 MHz spectrum they’ve picked up. They have rolled out this additional spectrum in Philadelphia.”

He tells KYW Newsradio (via Skype) that Verizon, which ranks third-fastest in Philly, edges out T-Mobile when it comes to availability of 4G.

Nationally, the company found T-Mobile averaging 16.3 Mbps in LTE speeds, with Verizon just behind at 15.9 Mbps.

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OpenSignal sampled billions of measurements from 120,000 people across the US for this report. Your phone can be part of the next survey; search ‘OpenSignal’ in the app store.