 In 1980, subscriber numbers in these areas were expanded to seven digits in phases to meet new demands.The first digit of a subscriber number is associated with a specific locale within the area code.In Bangkok, Nonthaburi, Pathum Thani, and Samut Prakan, the second digit of a subscriber number identifies the service provider, which is almost always Telephone Organization of Thailand (TOT), as TOT holds a near-monopoly of the Thai fixed-line market.