 How to call:
Exit Code ** - Exit code when making an international call from Singapore
84 - Vietnamese country code for inbound calls
4 - Hanoi city code
Exit Code ** + 84 + 4 + Local Number - International dialing code format
** Exit Code - Singapore has multiple telephone carriers: 002 (M1), 001 (SingTel), 008 (StarHub)
 World Times:
The time in Singapore is now 05:34:27 AM (05:34:27 AM)
The time in Hanoi Vietnam is now 04:34:27 AM (04:34:27 AM)
 Mobile codes:
To call a mobile phone in Vietnam from Singapore use the following dialing code format: Exit Code ** + 84 + 9# + The Number
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