Data, news and analytics giant Bloomberg has reported that the Rokr phone, a joint venture between Motorola and Apple to create an iTunes enabled handset, is not doing as well as hoped. 

The findings were based on research among US retailers and distributors by Albert Lin, an analyst at American Technology Research.

Lin claims that a high number of customers who have bought the phone are exchanging them for other handsets sooner than expected for a recently launched product.

A high profile advertising campaign featuring Madonna is currently running in the UK, but Motorola chief executive Ed Zander has said that he is " disappointed" with the marketing.

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