 How to call:
00 - Exit code when making an international call from Bulgaria
84 - Vietnamese country code for inbound calls
4 - Hanoi city code
00 + 84 + 4 + Local Number - International dialing code format
 World Times:
The time in Bulgaria is now 00:59:31 AM (12:59:31 AM)
The time in Hanoi Vietnam is now 04:59:31 AM (04:59:31 AM)
 Mobile codes:
To call a mobile phone in Vietnam from Bulgaria use the following dialing code format: 00 + 84 + 9# + The Number
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