TSIM Thailand SIM Card Using the sim card for the first time: 1. Power off your phone 2. Insert your new sim card 3. Power on your phone 4. Your phone should connect on a gsm/wcdma/lte network. Receiving calls: people in thailand can just dial your number preceded by 0 to reach you, for example, 08-1234-5678; people outside thailand need to dial +66 plus your number, for example, +66 812345678. Calling a mobile number in thailand: dial the 9 digit mobile number preceded by 0; thailand mobile number all starts with 8, 9 or 6. . Calling a fixed line number in thailand: dial 0 + area code + phone number; for example, 02-1234-5678 or 043-213456. Calling an international number when in thailand - super rate: dial 00300 or 00400+ country code + phone number. for example, to call india number 022 24216344, dial "00300912224216344" . The international dial code 00300 or 00400 will be mentioned on the card.