"Ookla fully stands behind the accuracy and reliability of the methodology used to designate Airtel as India's fastest mobile network," Ookla said in a statement.
Data accuracy and neutrality are of "utmost importance" to Ookla, the statement said, adding that the company goes to great lengths to ensure the information collected on the Internet test is "verifiably correct".
The carrier displayed in the Speedtest Android application is based on the 'Active Carrier' value returned by the device. "Due to limitations of the Android platform, the 'Active Carrier' does not always indicate the actual data provider in the devices with multiple SIMs. In these situations, Ookla applies additional data sources and mechanisms during post processing to help determine the actual data carrier being tested," it said.
"With reference to the issue of the fundamental flaw in Ookla's Speedtest methodology which Jio has pointed out repeatedly, we note that Ookla has now admitted to 'limitations' in its application, and that it 'does not always indicate the actual data provider in devices with multiple SIMs," Jio said in a statement.
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It added that this admission by Ookla reinforces Jio's submission that there is a clear contamination in primary data collected by Ookla in India, where nearly 90 per cent of smartphones are dual SIM devices.
This is the second such statement issued by Ookla in as many days to defend its position after Jio, earlier this week, said it has approached advertisement watchdog ASCI against Bharti Airtel's claims of being "officially the fastest network". Jio alleged that Airtel's claims were "misleading" and done in "mala fide manner in collusion with" broadband speed tester Ookla.
"In recent days, Indian telecom company Reliance Jio has made public statements regarding Ookla, primarily that Ookla has knowingly and blatantly released misleading results about the Indian mobile market," the Ookla statement pointed out.
Ookla said its methods allow it to determine the actual data carrier with "high degree of confidence", overcoming the limitations posed by the Andriod platform.