Acer Inc started to sell its first mobile phone model running on Google's Android software this week, and will introduce more Android handsets next year, the head of its phone unit said on Thursday.

The world's second-largest PC brand entered the cellphone market this year with 10 models, with all but the Android phone using Microsoft's Windows Mobile operating system.

"Next year it will be much more balanced," Aymar de Lencquesaing told Reuters in an interview.

"There is definitely momentum behind Android. The pace is faster than most would have anticipated one year ago," he said, adding that the company had no plans to use other operating systems

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