Notches up 17.2m unique users in one month.
The Guardian mobile site experienced a record-breaking 17.2 million uniques in February 2013, the newspaper reports, thus breaking the previous 17m record set in April 2012.
Meanwhile, the new milestone is a 7.9 per cent increase on January, and up 44.7 per cent year-on-year. The result follows The Guardian's decision to convert to responsive design back in November, a technology that automatically converts the site based on the accessing device.
Hot topics to encourage the spike include the Oscar Pistorius shooting, the Pope's resignation and the Russian meteorite.
David Pemsel, chief commercial officer, Guardian News & Media, said: "It's been another fantastic month for our digital platforms. As the number 1 quality newspaper mobile site, we continue to lead the way in this fast-growing market; separate figures confirm that our mobile site is almost one million unique monthly visitors ahead of our nearest rival, the Telegraph.
"Figures also reveal the loyalty of our mobile audience, with 58 per cent of m.guardian's unique monthly visitors using no other quality newspaper mobile site, which is great news for our commercial partners looking to reach a quality, engaged audience."
In related news, BBC Sport recently reported record mobile traffic for January, reaching 42m uniques and more than one billion page views.