Best Phone Number for Virtual Assistants in Vietnam

Vietnam has some of the fastest internet in the world. Here is how Vietnamese VAs get a US number, call clients abroad and avoid IDD costs, with 2026 data.

The best phone setup for a virtual assistant in Vietnam is a US (or Canadian) virtual number that rings in your browser and on your phone. Clients abroad call a number in their own country, and you skip Vietnamese IDD charges. ZephyPhone gives you that for $3.75 a month, with calls to the USA from $0.019 a minute and no contract. Vietnam's internet ranks in the world's top ten, so call quality is rarely the problem. Here is the data, the real cost of calling clients, and how your hours line up with theirs.

Virtual assistant work in Vietnam: the numbers

Vietnam's outsourcing story started with software for Japan, where it is the second-largest offshore supplier (Ministry of Science and Technology). English-language VA work for US, Australian and UK clients is newer and growing fast, helped by rising English scores and internet speeds that most countries cannot match. A voice call needs well under 1 Mbps, so bandwidth is not the limit; a stable connection and a good headset are.

Why Vietnamese VAs need a client-facing phone number

Most VA clients are in the USA, Canada, Australia and the UK. They pick up for a number in their own country, they call it back without thinking, and they save it under your name. A local mobile number with a foreign country code gets screened, costs the client an international call, and mixes client calls with your personal ones.

The usual workarounds each have a catch:

• WhatsApp or Viber calls only work if the client installs and opens the same app, and many US businesses do not use them for work.
• Your client's own phone system ties your number to one client. When the contract ends, the number goes with it.
• Google Voice is only offered to people in the US, so most VAs outside it cannot sign up. See Google Voice alternatives.
• International calls from a local SIM are expensive per minute, as the next section shows.

What calling a US client costs from Vietnam

MobiFone's add-on is cheap per minute, but every call still goes out from a +84 number. The client sees a foreign caller ID, and calling you back costs them an international call. A US number fixes both.

Carrier prices were read on October 7, 2026 and converted at that day's exchange rate (open.er-api.com). Promotions change often, so check your carrier before you rely on a figure.

Your working hours vs your clients'

Assuming your client works 9am to 5pm in their own time zone, this is when their day falls for you:

Vietnam is on UTC+7 all year. US clients mean evening and night work; Australian clients overlap with your morning, and UK clients with your late afternoon. A number that rings on your phone as well as your laptop means you can step away from the desk without missing a client.

Getting paid and paying for tools in Vietnam

Most Vietnamese freelancers receive client payments through Payoneer, Wise or PayPal, because individual US-dollar accounts are tightly controlled. ZephyPhone is prepaid in US dollars: top up with a Visa or Mastercard debit or credit card enabled for international online payments, or with Apple Pay or Google Pay. There is no subscription to forget except the number itself, which you can cancel when a contract ends.

Can I use a US number from Vietnam?

Yes. Vietnam's 2024 Telecommunications Law and Decree 163/2024 require SIM cards to be verified against the national population database, and cross-border calling apps to notify the regulator. Neither stops you, as a customer, from using an overseas calling service with a US number. Your Vietnamese SIM stays registered to you as normal.

How ZephyPhone works for a virtual assistant

• A US or Canadian number for $3.75 a month or $40 a year. Give it to clients, put it in your email signature and your OnlineJobs, Upwork or LinkedIn profile.
• Calls from the browser, iPhone or Android. Nothing to install on a client's laptop or a shared computer, and the same account on your phone.
• Incoming calls ring every device you are signed in on, so a client call during a night shift reaches you whether you are at the desk or not.
• Your number as caller ID. Outgoing calls can show your ZephyPhone number, so clients recognise you.
• An in-call keypad for the "press 1" menus of banks, airlines, suppliers and support lines you call on a client's behalf.
• Prepaid Minute Bundles for the USA, Canada and Australia that never expire. Calls on your own number in that country use the same bundle.
• No contract. Top up with a card, Apple Pay or Google Pay and stop whenever a contract ends.

Two honest limits. Incoming calls are not free: they are charged per minute at the rate for your number's country, shown on your Numbers page. And if you only ever call one client who already pays for your phone line, you may not need your own number at all.

Set it up in five minutes

1. Create a free ZephyPhone account with your email, Google or Apple.
2. Add credit with a card, Apple Pay or Google Pay.
3. Pick a US or Canadian number. Choose an area code in your main client's state if you can.
4. Sign in on your laptop browser and on the iPhone or Android app, so calls reach you on both.
5. Make a test call to a client, or to your own number from another phone, before your first shift.

Frequently asked questions

What phone number should a Vietnamese virtual assistant give US clients?

A US number. Clients answer local numbers, call them back for free on their plan, and save them as a contact. A ZephyPhone US number rings in your browser and on the ZephyPhone app.

Can I get a US phone number in Vietnam?

Yes. ZephyPhone sells US and Canadian numbers to people outside the US, and you buy one online in a few minutes. Google Voice is only offered to people in the US.

Is Vietnamese internet good enough for VoIP client calls?

Yes. Vietnam ranked in the world top ten for both fixed and mobile speeds in July 2026, and a voice call needs well under 1 Mbps.

How much does a US phone number cost for a virtual assistant in Vietnam?

A ZephyPhone US or Canadian number costs $3.75 a month or $40 a year. Calls to US numbers start at $0.019 a minute, and less with a Minute Bundle. Incoming calls on your number are charged per minute at the rate shown on your Numbers page.

Can my clients call me on the number when I am away from my laptop?

Yes. An incoming call rings every device you are signed in on: the browser, the iPhone app and the Android app. You can answer on whichever is closest.

Do I need a VPN or special equipment?

No. ZephyPhone runs in a normal browser or the mobile app over your existing internet connection. A headset with a microphone gives clients clearer audio than laptop speakers.

Will my client see my local number when I call them?

No. Calls you make from ZephyPhone can show your ZephyPhone US or Canadian number, so clients see a familiar number and can call you back on it.

Related guides

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• Virtual assistants in Indonesia
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• Virtual assistants in Malaysia
• Virtual assistants in India
• Rates for calling the USA
• Best apps to call the USA and Canada in 2026