To call Vietnam from the US, dial +84 followed by the Vietnamese number without the leading 0.
Mobile example: domestic 090 123 4567 → +84 90 123 4567
Ho Chi Minh City landline example: domestic 028 … → +84 28 …
At a glance
| Item | Detail |
|---|---|
| Country code | +84 |
| US exit code | 011 (or just use +) |
| Leading zero | Drop it |
| Hanoi landline | Often +84 24 … |
| Ho Chi Minh City landline | Often +84 28 … |
| App note | Zalo is widely used in Vietnam for app messaging/calls, not a substitute for every phone-network number |
| Toll-free | Vietnamese domestic freephone usually fails from the US |
| Live rate | Check rates for Vietnam |
Corridor landing: call Vietnam.
Number formatting
Vietnamese domestic numbers begin with 0. Internationally that 0 is removed after +84.
- ›Hanoi geographic: +84 24 …
- ›Ho Chi Minh City geographic: +84 28 …
- ›Mobiles: domestic 09x… / 08x… → +84 9x… / +84 8x…
Vietnam does not typically bill the receiver for ordinary incoming international calls.
Calling methods compared
| Method | Good for | Downsides |
|---|---|---|
| US mobile plan | Inclusive international plans | Without a bucket, rates vary, check your plan |
| Contacts already on WhatsApp | Less universal in Vietnam than in some other markets | |
| Zalo | Contacts who actively use Zalo | App-to-app only; not a bank IVR |
| Browser-to-phone (WorldDial) | Occasional calls to real Vietnamese numbers | Needs internet; check rates |
| Local Vietnamese SIM | When you are in Vietnam | Not useful from the US without roaming that SIM |
Vietnam-specific details
Remove the leading 0. Domestic 028… must become +84 28….
Hanoi vs HCMC formats. Many business landlines still publish city geographic codes (24 / 28). Copy the international format from the official contact page.
Zalo vs phone network. Zalo is a common way people in Vietnam message and call each other in-app. It does not replace dialing a bank, government office or landline that only answers on the telephone network.
Time zones
Vietnam uses Indochina Time (ICT, UTC+7) year-round.
- ›09:00 in Hanoi / HCMC is 21:00 Eastern the previous evening during US daylight saving time (EDT)
- ›09:00 in Hanoi / HCMC is 20:00 Eastern the previous evening during US standard time (EST)
If you need a live agent, call during that institution’s Vietnam business hours.
Cost
- ›WorldDial: check Vietnam on rates
- ›US mobile: varies significantly by plan
- ›Calling cards: may include connection fees
- ›WhatsApp / Zalo: free over data for app-to-app only
Common mistakes
- ›Forgetting to remove the leading 0
- ›Mixing Hanoi (24) and HCMC (28) area codes
- ›Expecting Zalo or WhatsApp to reach a landline IVR
- ›Dialing a domestic toll-free number from the US
- ›Calling during US daytime without converting from ICT
Checklist
- ›Dial +84 + number with leading 0 removed
- ›Confirm Hanoi / HCMC area codes when dialing landlines
- ›Use phone-network calling for banks and offices that are not on Zalo/WhatsApp
- ›Call during Vietnam business hours (ICT)
- ›Check the live rate if using WorldDial
Calling Vietnam?
See the live rate, enter the number in international format, and call from your browser.
Pay as you go • No subscription required • Recipient does not need WorldDial
FAQs
What is the international dialing code for Vietnam?
+84. From the US, dial +84 or 011 84, then the Vietnamese number without the leading 0.
Do I remove a leading zero?
Yes. 028… becomes +84 28…. 090… becomes +84 90….
Is Zalo a replacement for calling Vietnamese phone numbers?
Only when the other person is on Zalo. It does not dial arbitrary landlines or many institutional phone menus.
What's the cheapest way to call Vietnam from the US?
If the other person uses Zalo or WhatsApp, use that. If your US plan includes Vietnam, use it. Otherwise compare your carrier rate with the live WorldDial Vietnam rate.