TNA English news says : Holders of all mobile phones in Thailand will have their numbers adjusted to become 10-digit ones in September, the National Telecommunications Commission (NTC) announced [16 June 06].
...NTC had ordered all service providers to turn all domestic mobile phones, both previously and newly registered, to be the 10-digit phones from September 1, 2006.

"Under the plan, which will result in sufficient numbers to be offered to increasing mobile phone holders over the next 30 years, the number '8' will be added after '0' of each number,"...

"This means that the existing number, '09-1234567', for example, will become '089-1234567'...

All local mobile phone service providers will launch the 10-digit phone service on a trial basis in July.