Dial the international outgoing call prefix, or "exit code" for your country. In the case of the U.S., this is 011. If you do not know the exit code for your country, you can find it online at the How to Call Abroad website (See resources).
On many mobile phones, you can substitute a "+" symbol for the exit code. In this case, enter the "+" symbol as a prefix to the rest of the phone number and your phone will dial the exit code automatically.
Dial the country code. For Thailand, this is "66". So the dialing prefix for the entire country of Thailand, dialed from the United States, would be 011-66 (or +66).
Dial the area code or mobile prefix as listed. This will be either one or two digits. Bangkok's area code is 2. Mobile phones prefixes are usually the area code in which the phone was purchased, preceded by the number 8.
Remember that the local area code is often listed with a zero in front, and this is only for dialing from within Thailand. To call from abroad, drop the zero.
Dial the seven-digit number for the individual phone.