A phone number for OTP and SMS verification
Receive one-time passwords (OTP) and SMS verification codes on a real mobile number you control — for WhatsApp, Facebook, Telegram, Google and any other app. From $1.80 a month.
From $1.80/month on the 12-month plan · Choose your country
Why use a separate number for OTP codes
Keeping verification codes on a separate number protects your personal number from spam and data leaks, and lets you verify accounts in another country.
Because the number stays yours, you can receive new OTP codes whenever an app asks you to log in again or reset your password.
How it works
1. Choose a country and rent a number — it is active immediately.
2. Enter it in the app in international format (+ and country code).
3. The OTP arrives in your SMS Hallo inbox within seconds; copy it with one tap.
Covered if a code doesn't arrive
If the number doesn't work for you, replace it free with another number in the same country within 7 days, or get a 100% refund.
Get a number in any country
- United States (+1)
- United Kingdom (+44)
- Canada (+1)
- Germany (+49)
- France (+33)
- Netherlands (+31)
- India (+91)
- Australia (+61)
- Spain (+34)
- Italy (+39)
- Sweden (+46)
- Poland (+48)
- All countries
Frequently asked questions
What is an OTP number?
It is a phone number you use to receive one-time passwords (OTP) and verification codes by SMS. With SMS Hallo it is a real mobile number that stays yours.
Can I receive OTP codes from any country?
Yes. Numbers are available in 181 countries and you can read the codes from anywhere in the world.
Will I get OTP codes again later?
Yes. As long as you keep renting the number, you can receive new codes for logins and password resets.
What if an OTP never arrives?
Replace the number free within 7 days, or get a 100% refund if it doesn't work with your app.
Popular searches
An OTP reaches you in a chain: the app asks its SMS provider to send the code, the provider passes it to a mobile carrier, the carrier delivers it to your number, and with SMS Hallo it appears in your online inbox within seconds, ready to copy. When a code fails, the cause is usually the number format, the app's rate limits, the app declining that number, or a network delay — and every SMS Hallo number, in 181 countries from $1.80 a month, is covered by three guarantees if it doesn't work.
How an OTP travels from the app to you
When you tap “Send code”, the app creates a one-time password and asks an SMS provider to deliver it. The provider hands the message to a mobile carrier network, and the carrier routes it to the phone number you entered.
With SMS Hallo, that number is a real mobile number assigned to your account. Instead of reaching a SIM card in your pocket, the message lands in your SMS Hallo inbox. The dashboard detects the code and shows it with a one-tap copy button, on your phone or computer.
Every link in that chain belongs to a different party. SMS Hallo controls the last step, your number and your inbox; the app decides whether and when a code is sent.
Why codes fail: the number format
The most common problem is a number entered in the wrong format. Choose the right country in the app's country picker, then enter the rest of the number without the leading zero some countries use for local dialing. If the app asks for the full number, use the + sign and the country code.
Copy the number from your dashboard rather than typing it, and check it digit by digit before you press send.
Why codes fail: rate limits and waiting times
Many apps limit how often they send codes to the same number or account. If you tap “Resend” several times in a row, the app may stop sending for a while, and later codes may never be sent at all.
Wait for the timer the app shows before asking again. If nothing arrives after a few minutes, try the call option if the app offers one, since every SMS Hallo number also receives calls.
Why codes fail: the app declines the number
Apps decide which numbers they accept. Some check the type of number, the country or the number's history, and some decline a number without saying why; in that case the code is simply never sent.
Real (non-VoIP) mobile numbers are accepted by many apps, but no provider can promise that a particular app will accept a particular number. If that happens, use the free replacement to try another number in the same country, or request the 100% refund.
Why codes fail: network delays
SMS travels across several networks, and occasionally a message is slowed down on the way, especially across borders. Most codes arrive within seconds, but a short delay is not unusual.
Keep the inbox open, give it a couple of minutes, and avoid requesting a new code too quickly, because the first one may still arrive and a new request can cancel it.
The three guarantees behind every OTP number
7-day free replacement: swap for another available number in the same country, free, up to 3 times; the new number keeps the plan and expiry date.
Works — or 100% refund: if the number doesn't work with the app it was rented for, for example the code never arrives, request within 7 days and get 100% of what you paid.
7-day money-back: a full refund within 7 days, no questions asked, if no call or SMS has been made or received on the number.
Which type of number do you need?
Phone numbers you use online come in four main types, and they differ in who can read your messages and how long the number stays yours. Here is how they compare in general, so you can pick the right one for each account.
| Rented real mobile number (SMS Hallo) | One-time activation services | Free public receive-SMS sites | VoIP / second-number apps | |
|---|---|---|---|---|
| Who can read the SMS | Only you, while you rent the number | Usually only you, during the short activation | Anyone who visits the site | You, inside the app |
| How long you keep the number | As long as you renew: 1, 3, 6 or 12 months at a time, or auto-renew | Minutes, typically for one code | You don't own it; it's shared and can disappear | While your app subscription or account is active |
| Re-verification and 2FA recovery later | Yes, the number stays yours while you renew | Usually not; the number returns to a pool | Not reliable, and anyone can read the code | Possible, but some apps treat VoIP numbers differently |
| Outbound SMS and calls | Yes: 500 SMS and 1,000 minutes per month, plus unlimited incoming SMS and calls | Usually receive-only | Receive-only | Usually yes, depending on the app and plan |
| Typical pricing model | From $1.80 per month on the 12-month plan ($21.60 yearly), same in every country | Pay per code or per activation | Free, often supported by ads | Monthly subscription or credits |
| Refund or guarantee | 7-day free replacement, 100% refund if it doesn't work with your app, 7-day money-back if unused | Varies by service | None | Varies by provider |
| Countries | 181 countries | Varies by service | A limited, changing list | Often a few countries |
Getting your OTP, step by step
- Rent a number in the right country Choose the country the app expects. The number is active once your USDT or USDC payment is confirmed.
- Enter it in the correct format Select the country in the app, then paste the number from your dashboard, without an extra leading zero.
- Request one code and wait Tap “Send code” once and keep your SMS Hallo inbox open. Don't resend before the app's timer ends.
- Copy the code — or use the guarantees Copy the code in one tap. If it never arrives, swap the number free within 7 days or request a 100% refund.
Who uses SMS Hallo
Travelers
Keep receiving SMS codes while you're abroad, or use a local number in the country you're visiting, all without swapping SIM cards.
Online sellers
List items and talk to buyers from a separate number, so your personal number stays off marketplaces.
Freelancers and remote workers
Give clients a work number in the country you work with, and keep calls and texts apart from your private life.
People dating online
Share a second number with new matches and keep your personal number private until you're ready.
Small businesses
Get a business number with SMS and calls in the browser, without buying a new phone or SIM.
Developers and QA teams
Test sign-up and OTP flows in your own app on real mobile numbers from different countries.
Frequently asked questions
How fast should an OTP arrive?
Usually within seconds of the app sending it. The SMS Hallo inbox updates as messages arrive, and codes are detected and shown with a copy button. If nothing appears after a couple of minutes, check the number and country you entered, then wait for the app's resend timer. Requesting many codes in a row often makes things slower, because apps may pause sending to protect the account.
Should I enter the number with a + or a zero?
Use the country code, not the local leading zero. The safest method is to select the country in the app's picker and paste the rest of the number from your dashboard. If the app has a single field for the whole number, type + followed by the country code and the number. You can check any country's dialing code at /country-codes.
The app says it sent the code, but nothing arrived. What now?
First, wait a few minutes and make sure the number and country are correct. Second, don't resend straight away; wait for the app's timer. Third, if the app offers a voice call, try it, because your number receives calls too. If the code still never arrives, use the free replacement to try another number in the same country, or claim the 100% refund within 7 days.
Can I receive OTP codes by voice call?
Yes. Every SMS Hallo number includes unlimited incoming calls, and you can answer them in the browser dialer. Some apps offer “Call me” as an alternative when an SMS code doesn't arrive, and the code is then read out to you. Whether a call option is offered is up to each app. Your call log in the dashboard shows every incoming call.
Why does one app send codes while another doesn't?
Each app runs its own checks and chooses which numbers it accepts. One app might send codes to any mobile number, while another might be stricter about the country, the number type or how the number has been used before. That is why SMS Hallo never promises a specific app will accept a number, and instead backs every number with a free replacement and a 100% refund.
Can I use the same number for OTPs from several apps?
Yes. One number can receive codes from as many apps as you like, since incoming SMS are unlimited. Keep in mind that each account then depends on that number, so renew it while those accounts are in use. Use the number for your own legitimate accounts only; creating fake or bulk accounts is against the Acceptable Use Policy.
Is it safe to receive OTP codes in an online inbox?
It is private: while you rent the number, only you can see its messages, and the inbox is never published like a free SMS site. Protect it as you would your email: use a strong, unique password for your SMS Hallo account, and don't share codes with anyone. Where an app offers extra security, such as an authenticator app, a PIN or backup codes, turn it on too.
Will I get new OTP codes months from now?
Yes, as long as you keep the number. Codes for new logins, new devices and password resets reach the same number while it is active. Renew for 1, 3, 6 or 12 months or switch on auto-renew. If a number expires, it may be given to someone else, so keep numbers linked to important accounts renewed.
What doesn't SMS Hallo control in OTP delivery?
SMS Hallo controls your number and your inbox. It doesn't control whether an app decides to send a code, how often the app allows resends, or which numbers the app accepts. That is why the guarantees are built around the outcome: if the number doesn't work with the app you rented it for, you can swap it for free or get a 100% refund within 7 days.