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Likewise to call mobile phones from land line or mobile phones, dialing begins with 08 followed by 8-digit phone numbers. To the confusion of foreigners[citation needed], mobile phone numbers in Thailand are one digit longer than land line numbers. Thailand had been using a 2-digit prefix for mobile phones (01, 06, 09, for example). The authority[who?] has recently (since October 2006)[citation needed] changed the system into a 3-digit prefix (01 became 081, 06 became 086, and so on by simply adding number 8 after 0). So mobile phone numbers in Thailand are 10 digits long while land lines are only 9 digits long.
Calls made from outside Thailand must omit the prefix 0. Therefore to call a mobile number in Thailand from other countries, dialing begins with +66 8 xxxx xxxx.