How to Call from Vietnam to the US? A Step-By-Step Guideline

While making a call from Vietnam to the US, you need to know Vietnam’s exit code as well as the US country code, area code, and the recipient’s phone number (subscriber number).

• Vietnam’s Exit Code: Vietnam's international exit code is “00”. You can also replace this code with “+” while calling from a mobile phone. This code signals your telephone network that you’re making an international call.
• US Country Code: The US country code is 1. It directs your call towards the US telephony network.
• US Area code: The US has over 300 area codes (3-digits). You must know the accurate area code of your intended region to ensure the call connects accurately.

Some popular cities and their area codes in the United States are:

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To call from Vietnam to the US, dial Vietnam’s exit code, followed by the US country code, the area code of the specific city, and the local number.

• Step 1 - Dial Vietnam’s Exit Code “00” or “+”.
• Step 2 - Dial the US country code, “1”.
• Step 3 - Dial the local area code of the region.
• Step 4 - Dial Phone Number

The best time to call the US from Vietnam is during the US’s business hours, i.e., between 9 AM and 5 PM. However, you can call at any other appropriate time if it is a personal call.

Additionally, the US has four primary time zones, Eastern, Central, Mountain, and Pacific, compared to Vietnam’s only one, Indochina Time. So, you must also consider the time zone differences to ensure your call connects at the right time.

Here is a table showing the best time to call the US from Vietnam depending on the US time zones.
 

For low-cost international calls to the US from Vietnam, consider using a VoIP phone system or internet-based calling apps, international calling cards, or Vietnam Carrier with special offers.

Online platforms like Facebook Messenger, Instagram, and Snapchat are some popular social media platforms offering zero-cost calling services. However, both parties must use the same app to make the calls.

Similarly, VoIP service providers offer a virtual phone number, which allows you to make calls over the internet. They typically offer lower costs for international calls compared to the traditional carriers.

International calling cards are prepaid cards that come with specific charges that you can use to dial international numbers. Once you purchase a card, simply dial an access number, enter your PIN, and dial the US phone number you wish to reach.

However, be sure to check the card for per-minute rates, potential fees, and expiration dates, as these can vary between providers and calling destinations.

Vietnam telephone carriers like Viettel, VinaPhone, and MobiFone offer special packages for international calls, including the US, at discounted rates.

For instance, MobiFone offers different packages, such as TQT49, TQT99, TQT199, and TQT299 for low-rate international calls. After subscribing to any of these plans, simply enter 1313 before the US phone number format (1313 + 00 + 1 + Area Code + Phone Number) to make a low-cost call.

Calling the US from Vietnam is straightforward once you understand the correct dialing format and time zone differences. Additionally, by using VoIP services or internet-based calling apps, you can significantly reduce the cost of international calls. Upgrade to Calilio’s cloud telephony for affordable international calls.

To call the US from Vietnam using a VoIP service, register and sign in to your account, open the dialer in the app, dial your desired US number, and then hit the Call button.

Yes, you can call from Vietnam to the US for free using internet-based apps like WhatsApp, Viber, and Instagram, among others. These apps allow you to make calls over WiFi or mobile data and are free if both parties use the same platform.

Yes, you can call the US from Vietnam without an internet connection by using your phone carrier’s International Direct Dialing (IDD) service. This method routes the call through your carrier’s traditional network instead of the internet.