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telephone subscribers of the public switched telephone network to use PHS as a value added service with the same telephone number and shared the same voice mailbox. The PCT service was commercially launched in November 1999 with the peak of 670,000 subscribers in 2001. However, the number of subscribers had declined to 470,000 in 2005 before the breakeven in 2006 after six years of heavy investment up to 15 billion THB. With the popularity of other cellular phone services, the company

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