United States+1Tip: If the number starts with {prefix}, we'll remove it automatically for international dialing.
Check with your provider for international rates. Standard carrier charges may apply.
Dialing formula from Vietnam to United States
To call United States from Vietnam, dial: 00 + 1 + area code + local number
Example: 00 1 XX XXXX XXXX (where XX is the area code)
Current time and best calling window between Vietnam and United States
Step-by-step calling United States from Vietnam
- 1
Dial the Vietnam Exit Code: 00
- 2
Enter the United States Country Code: +1
- 3
Input local United States area code and local number
- 4
Check the time zone and best time to call: UTC-5 to UTC-10
Generations reconnecting
Vietnamese-Americans—over 2 million—maintain connections with the homeland. Whether calling relatives who stayed, coordinating business ventures, or planning homeland visits, this corridor stays busy.
Everything you need to know about calling United States from Vietnam
Connecting with friends, family, or business partners in United States from Vietnam is straightforward when you understand the correct international dialing protocols. Whether you are calling a landline in New York City or a mobile phone in a remote province, this guide ensures your call connects on the first attempt.
The dialing sequence explained
To place your call, you must first signal to your local carrier that you are making an international call by dialing the Exit Code (IDD). For Vietnam, this code is 00.
Once you have exited the local network, you must enter the Country Code (ISD) for United States, which is +1. This tells the global switching system to route your call specifically to United States's infrastructure.
Important rule on the trunk prefix
A common point of confusion is the 'Trunk Prefix'—usually a 1. In domestic calls within United States, this digit is used to signal a long-distance call. However, when calling internationally, this prefix must be omitted. If the local number you have is 112345678, you would only dial 12345678 after the country code.
Check the local time zone and scheduling considerations
Before you dial, consider the significant time difference. United States is currently 12 hours behind Vietnam. While it might be mid-afternoon for you in Ho Chi Minh City, it could be the middle of the night in New York City.
Our live tracker shows that it is currently 17:33 in United States. Based on standard business hours (09:00 to 17:00), we categorize this time as Social Hours. Calling during 'Social Hours' (07:00–09:00 or 17:00–21:00) is generally acceptable for personal calls, but we recommend avoiding 'Night Hours' (21:00–07:00) unless it is an emergency.
Cost-saving tips
International carrier rates can be high. For longer conversations, consider using data-based platforms or checking with your provider for international calling bundles specifically for the Vietnam to United States corridor. Finally, save contacts in the '+' format to avoid manual dialing in the future.