ViOTP is a Vietnam-first paid SMS service that fits a buyer inside Vietnam paying with Momo or Internet Banking, but it is a hard sell for anyone outside that country. The site is Vietnamese-only, prices sit behind registration, and there is no independent reputation to weigh from outside. Bottom line: 4.1/5, a workable local option, awkward everywhere else.
There is no public price list on ViOTP. Every rate for single-use codes, weekly rentals and monthly rentals sits inside the dashboard after registration and top-up, so the cost of a code cannot be compared before opening an account. That is unusual in this market, where most competitors publish per-service pricing openly.
Prices on every activation service shift with real-time number availability. Always check the live price for your exact service and country before topping up.
The ViOTP dashboard is where the SMS service actually lives. Prices, country availability and the list of phone numbers on sale all sit inside the account, not on the public site, so the whole purchase happens after registration and a top-up.
Country choice is not visible from the front page; the catalogue lives behind the login. ViOTP positions itself around Asian numbers and claims Asia's largest SIM inventory on its home page, but that scale claim is theirs alone and cannot be verified from outside. Actual availability by country is only readable once you are inside the dashboard.
Payment on ViOTP is the practical barrier for a foreign buyer. Top-ups run through Vietnamese Internet Banking, the Momo wallet or prepaid phone cards, and none of these rails are easy to reach from outside Vietnam. There are no card processors, no crypto and no international wallet on the checkout, so a buyer without a Vietnamese bank account or Momo wallet will struggle to fund the account at all.
We read the live ViOTP site and its second domain viotp.net, walked the checkout as far as an English-speaking buyer can (registration screens, top-up options and plan shapes for an SMS purchase), and reviewed the terms of service, refund policy and privacy policy dated 14 July 2026. We looked for a mobile app listing on the stores and for outside reputation signals on public review sites. No activation runs were performed on ViOTP, so we do not claim delivery percentages of our own. Everything below is what a careful buyer can verify from the public site and its documents.
| Metric | SMS Verification Number | ViOTP |
|---|---|---|
| Interface language | English | Vietnamese only, with no switcher |
| How you top up | Cards, PayPal, UPI, Revolut, Alipay and crypto | Vietnamese bank transfer, the Momo wallet or prepaid phone cards |
| Seeing a price before you register | Yes | No, both pickers sit behind the login |
| Who you are contracting with | A named company | By their own terms, no fixed legal entity, office or jurisdiction |
| Getting API access | Self-serve | By request through their Facebook page |
SMS Verification Number is our top-rated pick, so we use it as the reference column. The numbers come from our own hands-on testing above; a competitor's availability changes over time, so your results may vary.
Comparable providers from our independent index. We list our top-rated pick first, then close alternatives. Compare and choose what fits your task.
Private, exclusive numbers across 200+ countries for WhatsApp, Telegram and 1,000+ apps. Low per-code pricing, repeated SMS, API, and the widest payment list. Our top-rated provider overall.
Paid SMS service with an English interface and per-service pricing shown before checkout.
Paid SMS service with an English site, self-serve API and standard international payment rails.
The site is Vietnamese only and every price sits behind the login, we could not check the cost of a single code without registering and topping up.
— SMS ActiveR test team · ViOTP public site walkthroughThere is no public review sites profile for viotp.com, and the terms deliberately do not name a company or jurisdiction, for a buyer outside Vietnam that is a lot of trust to extend blind.
— SMS ActiveR test team · Reputation and legal review, documents dated 14 July 2026ViOTP is workable in Vietnam only. The service is built for local buyers who read Vietnamese and pay with a local wallet, and for them the flow is fluent. An English-speaking buyer runs the whole purchase through a translator, top-up rails are local, and the API is not self-serve. If you are already inside Vietnam and want Asian phone numbers by the week or month, ViOTP is a reasonable pick. If you are not, an English-language SMS service with public pricing and open payments is the safer route.
ViOTP is a paid Vietnamese SMS service that sells real SIM phone numbers for one-off verification codes or as weekly and monthly rentals. It targets buyers inside Vietnam who want Asian phone numbers for online services and messengers, with anonymous sign-up and no identity documents required. The brand also runs a second domain, viotp.net, linked from the footer of the main site.
No. The site is Vietnamese only, with no language switcher and no English documentation. An English-speaking buyer reads the whole purchase through a translator.
Not on the public checkout. Top-ups go through Internet Banking, the Momo wallet or prepaid phone cards, all Vietnamese rails, so buyers outside Vietnam usually cannot fund the account.
There is no self-serve API on the site. You have to write to the customer-care Facebook page and ask; access is granted case by case.
No. The catalogue of phone numbers and every price sits inside the dashboard, so registration and a top-up come before you can check the cost of a code.
Real SIM numbers. The site does not sell a VoIP virtual number, which is why the pass rate on strict services tends to be higher than free public SMS boards.
Yes, if you tick the repeat-SMS option before the transaction closes. Miss that step and the second code will not land on the same phone number.
No mobile app is listed on the site. Everything runs through the web dashboard.