 How to call:
001 - Exit code when making an international call from Hong Kong
84 - Vietnamese country code for inbound calls
4 - Hanoi city code
001 + 84 + 4 + Local Number - International dialing code format
 World Times:
The time in Hong Kong is now 11:56:55 AM (11:56:55 AM)
The time in Hanoi Vietnam is now 10:56:55 AM (10:56:55 AM)
 Mobile codes:
To call a mobile phone in Vietnam from Hong Kong use the following dialing code format: 001 + 84 + 9# + The Number
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