In the first two weeks of May, Jamster ran 36,382 ad spots, the majority for the Crazy Frog tone, according to Nielsen Media Research.
The next highest number of appearances was for McDonald's, which bought 9780 slots.
Jamster has been running the highest number of TV ads each month for the past year, but until last month, 85% of these spots were booked on cable and satellite channels.
Jamster switched more of its budget to ITV in May, running 3529 spots on the channel in the first half of the month. Tesco, its nearest rival, bought 972 slots.
The Crazy Frog spot has attracted 110 complaints to premium-rate regulator Icstis and 850 to the Advertising Standards Authority.
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