The electric current is 220 volt AC (50 cycles) throughout the country. Many different types of plugs and sockets are in use. Travellers with electric shavers, hair dryers, tape recorders and other appliances should carry a plug adapter kit. The better hotels will make available 110-volt transformers.
Tap water: Tap water is clean but drinking from it directly should be avoided. Bottled water is recommended.
Light, cool clothes are sensible and a jacket is needed for formal meetings and dining in top restaurants. Shorts (except knee length walking shorts), sleeveless shirts, tank tops and other beach-style attire are considered inappropriate dress when not actually at the beach or in a resort area.
Weights & Measures :
The metric system is used throughout Thailand . Numerals on vehicle speed ohmmeters, highway markers and speed limits all indicate kilometres.
Business hours :
Most commercial concerns in Bangkok operate on a five-day week, usually from 8 am to 5 pm . Many stores open seven days a week from 10 am to 10 pm. Government offices are generally open between 8.30 am and 4.30 pm with a noon to 1 pm lunch break, Monday to Friday except on public holidays. Banks are open Mondays to Fridays from 9.30 am to 3.30 pm except on public holidays.
Postal Services :
Thailand 's mail service is reliable and efficient. Major hotels provide basic postal services on their premises. Provincial post offices are usually open from 8.00 a.m. to 4.30 p.m.
International Roaming Mobile Phone : A Subscriber Identity Module Card (SIM Card) is now available for Thai and foreign customers who are travelling around for work. The SIM Card must be used in conjunction with a Digital GSM mobile phone within the 900-MHz range or a Digital PCN mobile phone within the 1800-MHz range.
Fax and E-Mail :
All of Thailand 's leading hotels offer facsimile (fax) and e-mail services. Numerous private businesses offer such facilities, most often in conjunction with translation services.
Internet Services :
Thailand has been expanding its information service for residents and tourists alike through the Internet system. Services are now available at Thailand 's leading hotels and at the many " Cyber-Cafes " that are cropping up in all major tourist destinations.
Telephone Services : At present, all telephone numbers (for local calls and long distance calls within the country) have nine digits.