+66-52-(000000...999999): Chiang Mai, Lamphun, Mae Hong Son and Chiang Rai, Northern Region Číst dál +66-52-(000000...999999)
+66-53-(000000...999999): Chiang Mai, Lamphun, Mae Hong Son and Chiang Rai, Northern Region Číst dál +66-53-(000000...999999)
+66-54-(000000...999999): Lampang, Payao, Phrae and Nan, Northern Region Číst dál +66-54-(000000...999999)
+66-55-(000000...999999): Phitsanulok, Uttaradit, Tak, Sukhothai and Kamphaeng Phet, Northern Region Číst dál +66-55-(000000...999999)
+66-56-(000000...999999): Nakhon Sawan, Chainat, Uthai Thani, Phichit and Phetchabun, Northern Region Číst dál +66-56-(000000...999999)
