Shares of

AT&T Wireless

(AWE)

rose in pre-market trading Tuesday on the heels of a

Financial Times

report that it is in talks to sell a stake to Japan wireless powerhouse

NTT DoCoMo

.

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DoCoMo is seeking a stake of between 10% and 20% in AT&T's wireless unit, according to the report. The value of the deal would be between $5 billion and $10 billion. Price is the biggest stumbling block in the talks, according to the report.

Previously,

AT&T

(T) - Get Report

announced plans to split into four units, one of which would be the wireless unit, which now trades as a tracking stock. The conversion of the wireless unit from a tracking stock to common stock is said to have made the investment more attractive to DoCoMo, the report says.

DoCoMo has been aggressively seeking new markets for its wireless services. AT&T Wireless has 14 million customers.

AT&T Wireless was trading at $23.88 on

Instinet

Tuesday morning, up from its Monday close of $23.06.