Lee Brook and Tony Haigh won the award for best radio spot of the month for "sneezy otter" for the Nokia 3300.
The ad beat off competition from an Ogilvy & Mather ad for Ford Fiesta and a spot by Clemmow Hornby Inge for English Heritage.
Brook and Haigh's ad highlights the range of features of the handset, especially its ability to record ringtones. It starts with a voiceover saying "This is the sound of an otter with a nasty case of hayfever" before playing the sound of an otter sneezing into water and inviting listeners to record it with a Nokia 3300.
The monthly Aerial Award, in association with Campaign, was judged by Luke White, the creative director of McCann-Erickson. He said: "It's a good product demo, something that can be heard on radio but, as it's for ringtones, radio's the perfect medium."
Grey's ad and the runners-up can be heard at the Aerials website (www.aerials.co.uk).
The annual Aerial Awards, organised by the Radio Advertising Bureau, will be held on 4 November at London's UCL Bloomsbury Theatre.