Telescope UK, which provided the text-messaging voting services for Pop Idol, is being sold in a £1.9 million deal.
The group is being bought by iTouch, which provides mobile phone services such as games, alerts and ring tones.
Telescope specialises in the technology which fans of interactive TV shows use to register their vote over the telephone or internet.
It is also advising the makers of American Idol, the US version Pop Idol, about televoting.
Chief executive Edward Boddington and managing director Michael Nelson-Jones, who founded the firm in 1998, will join iTouch once the deal is completed.
Mr Boddington said: "With iTouch's experience and technological capabilities in mobile services, combined with our experience in voice services, we believe the deal will provide a compelling proposition."
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