Tests ran on roads covering about 308 kilometres and at ten busy spots.
Signal strength was measured for second, third, fourth and fifth generation networks.
Dropped calls were counted for each company.
Download speeds reached up to 221 megabits per second for the fastest network.
The findings were shared with the phone companies to improve service.
The test used cars and walkers to check signal strength, call drops, silence and data speed.
Airtel had the fewest dropped calls, while Reliance Jio had the fastest download speed.
The results are posted online for people to see which network works best.
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