0066 and +66 are used interchangeably to dial Thai phone numbers from a mobile (more on the plus sign).
| Phone type | Dialing format | Or using + |
|---|---|---|
| VoIP | 00 66 60 xxx xxxx | +66 60 xxx xxxx |
| Cell phone | 00 66 8 xxxx xxxx | +66 8 xxxx xxxx |
| Cell phone | 00 66 9 xxxx xxxx | +66 9 xxxx xxxx |
| Landlines | Dialing format | Or using + |
|---|---|---|
| Bangkok | 00 66 1 xxx xxxx | +66 1 xxx xxxx |
| Bangkok | 00 66 2 xxx xxxx | +66 2 xxx xxxx |
| Chiang Mai | 00 66 52 xxx xxx | +66 52 xxx xxx |
| Chiang Mai | 00 66 53 xxx xxx | +66 53 xxx xxx |
| Chon Buri | 00 66 33 xxx xxx | +66 33 xxx xxx |
| Chon Buri | 00 66 38 xxx xxx | +66 38 xxx xxx |
| Hat Yai | 00 66 74 xxx xxx | +66 74 xxx xxx |
| Lampang | 00 66 54 xxx xxx | +66 54 xxx xxx |
| Nakhon Ratchasima | 00 66 44 xxx xxx | +66 44 xxx xxx |
| Nonthaburi | 00 66 1 xxx xxxx | +66 1 xxx xxxx |
| Nonthaburi | 00 66 2 xxx xxxx | +66 2 xxx xxxx |
| Samut Prakan | 00 66 1 xxx xxxx | +66 1 xxx xxxx |
| Samut Prakan | 00 66 2 xxx xxxx | +66 2 xxx xxxx |
| Udon Thani | 00 66 42 xxx xxx | +66 42 xxx xxx |