The international country code to dial into Vietnam is +84. To dial overseas from within Vietnam, dial 00 followed by the relevant country code and phone number. Emergency numbers in Vietnam are: Ambulance (115); Fire (114); and Police (113).
Although Vietnam is in the process of modernising its communication systems. The easiest mode of communication is by telephone. All hotels allow the use of telephones and some do not charge for domestic calls. International direct dialling facilities are also easily available and standard charges are applicable. However, if you are using this facility from a hotel, it may work out to be expensive.
The most convenient way to communicate when you are in Vietnam would be to make use of cellular phone technology. All you need to do is buy a pre-paid phone-card and you can be in touch wherever you go. Recharge the card when your talk time is over. All incoming calls are free in Vietnam, regardless of where the calls come from.
You have to pay the local rate for local calls and the charges for international calls per minute are also very reasonable. There is a concession when you call during off-peak hours: 11:00pmto 7:00am. The cellular phone system in Vietnam is GSM. Ever since the government of Vietnam has permitted Internet usage in the country (in 1997). There are internet cafes in most hotel lobbies and business centres, which you can use to access your mail by paying 4,000 to 5000 VND per hour. However, some sites have been blocked by the government.