The drive is part of the station's Heysexy customer acquisition SMS drive, devised by youth marketing agency Angel.
The campaign, which launched in 2000, has generated more than 100,000 new Kiss 100 database members and increased audience figures by 10.6% year on year.
This year's campaign, which launches early next month, aims to add a further 30,000 15- to 24-year-olds to its database.
Trevor Rudder, managing director of Angel, said: "The Heysexy promotion is a great way of kickstarting new relationships with young London and provides us with the perfect platform upon which to continue dialogue using CRM via SMS."
The creative aims to cement Kiss's position as being at the heart of young London. It features the two characters introduced in last year's work, but they have grown up to become sexy, streetwise young adults, who appreciate the glamour associated with the city. It is based on the theme "I love London".
The campaign uses a competition to encourage consumers to send in their details. Participants have to register their details, listen to Kiss 100 and answer their phone "Hey sexy" every time it rings.
If they answer the phone in this way and a Kiss DJ happens to have called them they will win £1,000 cash, or an appropriately London-style prize of the same value or exclusive prize such as a one-off radio slot on Kiss or a Kiss DJ playing at their party.
Kiss brand manager Afdhel Aziz said: "This is all about celebrating one of the sexiest capital cities in the world and communicating this message to our target audience. The promotion offers young London the chance to win fun and sexy prizes and to join in with Kiss 100's 'livesexy' in London philosophy."
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