ROUND ROCK, Texas (AP) — PC maker Dell is working on a smartphone for China Mobile, China's biggest cell phone carrier.

Rumors of a Dell phone date at least to 2007. Now Dell spokesman Matthew Parretta says the company showed a "proof of concept mobile device prototype" at an event hosted by China Mobile in Beijing on Monday.

Parretta would not say when a Dell phone would be ready for use, or what operating system it might have.

China Unicom, the country's second-largest wireless carrier, is in talks with Apple about selling the iPhone in China.

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