The appointment comes as major mobile companies struggle to differentiate their offerings in a market which is close to saturation point.
There are currently 230 million subscribers across the US, and it is thought that about two-thirds of Americans likely to acquire a mobile phone already have one.
The review originally involved Sprint Nextel's incumbent agencies, Publicis & Hal Riney and TBWA\Chiat\Day in New York. Hal Riney dropped out along with TBWA, the agency for Apple which is launching a mobile device with AT&T. Young & Rubicam was eliminated from the review last week.
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