How to Get a Serbia Phone Number for SMS
Open MarioSMS, pick Serbia (+381) and the service you want to verify, then rent a real Serbian mobile number for that one check. Type the number into the sign-up form, request the code, and it shows up in the MarioSMS app or dashboard, usually within a minute. The screenshot below shows a +381 number waiting for its code.
Every rental comes with a timer. If no SMS reaches the number before the timer ends, MarioSMS cancels the activation and puts the full price back in your balance automatically. You don’t need to open a ticket or ask for a refund. The image below shows a cancelled activation with the refund already applied.
What you get with a rented +381 number
You rent a number for one SMS verification, not as a long-term line. You use it for privacy, for a second account you have a legitimate reason to keep, or for QA testing of OTP flows. The table below shows what each rental includes.
| Item | What you get |
|---|---|
| Number | A real Serbian mobile number with the +381 prefix |
| Scope | One verification per rental |
| Code delivery | In the app or dashboard, usually within a minute |
| Price | From $0.04, varies by service |
| Access | iOS app, Android app, web app at app.mariosms.com, REST API |
Prices and stock change by service. The Serbia numbers page lists what is available right now.
What happens if the code never comes
The refund runs automatically. This is the sequence:
- You rent the number and the activation timer starts.
- You enter the number in the target service and request the code.
- If no SMS arrives before the timer runs out, the activation cancels itself.
- The price goes back to your MarioSMS balance, and you can rent a fresh +381 number or choose a different service.
If a code never arrives, you lose the minutes you spent waiting but none of your balance. Most people request the code again with a new number from the same country.
Why do apps check the country of your phone number?
A sign-up form reads more from your phone number than where to send the code. The country code and the type of line tell the service which region the account belongs to, which SMS route to use, and how much it trusts the number. A Serbian number that matches your location or test plan gets fewer rejections than a mismatched one.
How a service reads the +381 prefix and the line type
When you enter a number, the service splits it into a country code, a network prefix and a subscriber number. Serbia’s country code is +381, and Serbian mobile numbers start with 6 after it (06x when dialled inside the country). From the prefix, the service can pick the local SMS route, set the default language and region, and apply the rules it has for that market.
Many services also run a carrier lookup to sort the line into mobile, landline or VoIP. VoIP lines can be created in bulk for very little, so a lot of sign-up flows refuse them or flag them for extra checks. A VoIP number often fails at the “enter your phone” step before any code is sent. A non-VoIP number is issued by a mobile carrier and shows up in the lookup as a normal mobile line. MarioSMS rents real mobile numbers, which is why they pass checks that many virtual lines fail.
Who needs a Serbian number: travellers, expats and QA teams
Travellers on a short stay in Serbia often find that local apps for tickets, food delivery or rides only accept +381 numbers, or work better with one. Renting a number for a single sign-up means you don’t need a local SIM for a week-long trip.
Expats who keep their home SIM as their main line can use a Serbian number to sign up for local services and keep their personal number off those accounts.
QA teams need +381 numbers to test OTP flows the way Serbian users see them. That covers checking that the code arrives on a Serbian carrier, that forms accept the +381 format, and that the message text shows up correctly in both Latin and Cyrillic script.
Why one number covers one verification
A MarioSMS rental is tied to a single number activation. You rent the number, request the code, and the code shows up in the app or dashboard, usually within a minute. Prices start at $0.04 because the number is only held for that one activation window.
So a rented number fits a sign-up or a test run. It does not fit an account you plan to keep for years. Once you’re in, add a number you control or an authenticator app, so you can still recover the account after the rental ends.
How do you rent a Serbia number in the MarioSMS app, step by step?
Pick the service first, then Serbia in the country list
The steps are the same in the iOS app, the Android app and the web app at app.mariosms.com. You choose the service before the country, because stock and price depend on both. The screenshot shows the service picker with Serbia selected in the country list.
Pick the service, then Serbia in the country list
- Top up your balance by card or crypto. One activation starts at $0.04, so a small top-up covers several attempts.
- Search for the service you want to sign up for and tap it.
- Scroll the country list, or search, and choose Serbia. The current price for that service in Serbia appears next to the country, and the full list is on the Serbia numbers page.
Use the number while the timer runs
After you confirm, the app reserves a Serbian number in +381 format and starts the activation timer. The screenshot shows a reserved number with the countdown running. Keep the app open in another tab or window so you can come back to it quickly.
A Serbia number, reserved while the timer runs
- Copy the full number. Some sign-up forms want the +381 prefix and others have a separate country dropdown, so check which one the form uses.
- Paste the number into the sign-up form and request the SMS. Do this right away, because the timer is already running.
Copy the code from the app or dashboard
The one-time code shows up on the same screen as the number, usually within a minute, as in the screenshot. You don’t need to refresh anything. The message appears under the number, with the code shown separately so you can copy it in one tap.
The code arrives in the app, usually within a minute
- Copy the code and enter it in the sign-up form before the timer reaches zero.
- If nothing arrives before the timer ends, the activation cancels and the price goes back to your balance automatically. You can then try another number.
Doing the same through the REST API
If you test OTP flows on a schedule, the REST API covers the same steps without the app. Your script picks a service and a country, rents a number, reads the incoming SMS for that activation, and cancels if no message arrives. The documentation has examples in Python, Node.js, Go and PHP.
A typical QA setup rents one Serbian number per test run, passes it to the sign-up form under test, and checks the code a few seconds at a time until it arrives or the activation window ends. The balance, prices and automatic refunds are the same as in the app, so each run costs the same as a manual one.
Which services have Serbia numbers in stock, and what do they cost today?
Most stocked services for +381 numbers
Stock for Serbian numbers changes through the day as numbers get rented, used and retired. The table below lists the services with the most +381 numbers available when this guide was updated. Each row shows the current price for one activation and how many numbers are ready to rent.
Serbia numbers: most stocked services
| Service | Price | Numbers in stock |
|---|---|---|
| nike | $0.35 | 1,960,404 |
| Discord | $0.12 | 1,960,288 |
| Microsoft | $0.14 | 1,941,912 |
| airbnb | $0.10 | 1,775,135 |
| PayPal | $0.27 | 1,747,573 |
| $0.35 | 1,698,679 | |
| careem | $0.10 | 1,645,567 |
| baidu | $0.10 | 1,572,562 |
| Ticketmaster | $0.10 | 1,495,376 |
| Viber | $0.18 | 1,411,359 |
| Yahoo | $0.67 | 1,405,346 |
| KakaoTalk | $0.14 | 1,278,069 |
Source: MarioSMS catalog, 2026-10-03. Price per number, stock in brackets.
Cheapest Serbia numbers today
Serbia prices start at $0.04 per number, and the table below lists the lowest-priced services right now. Every number is a real mobile line whatever it costs. The price depends on how many numbers are available for that service in Serbia and how many people want them.
Cheapest Serbia numbers today
| Service | Price | Numbers in stock |
|---|---|---|
| airbnb | $0.10 | 1,775,135 |
| careem | $0.10 | 1,645,567 |
| baidu | $0.10 | 1,572,562 |
| noon | $0.10 | 356,637 |
| Ticketmaster | $0.10 | 1,495,376 |
| POF | $0.10 | 436,393 |
| $0.10 | 392,553 | |
| Discord | $0.12 | 1,960,288 |
Source: MarioSMS catalog, 2026-10-03. Price per number, stock in brackets.
Both tables are snapshots taken when the guide was updated. Before you top up, check live prices and stock on the Serbia numbers page or in the app. A popular service can go from plenty of stock in the morning to none by evening, and its price can change too.
Why the same service costs more in one country than another
Each price is set for one service in one country, so the same app can cost different amounts on a Serbian, Belgian or Israeli number. Three things drive the difference:
- Supply. Some countries have more mobile numbers available for a given service, so each activation costs less.
- Demand. When many users want the same service in the same country, numbers run out faster and the price goes up.
- Reuse. Once a number has received a code for a service, it is usually not offered for that service again. Popular services need a steady supply of fresh numbers, so they cost more.
A higher price does not mean more risk to your balance. If no SMS arrives before the activation window ends, the activation cancels and the full price goes back to your balance automatically.
When a different country is the better choice
Pick Serbia when the app needs a Serbian number, for example a local service, regional content, or a QA test of a +381 sign-up flow. If any country will do, compare Serbia against the other 35+ countries in stock before you rent.
| Situation | Better choice |
|---|---|
| The app must show or accept a +381 number | Stay with Serbia |
| The service shows zero Serbian stock | Pick a country where it is in stock and the app accepts |
| You are testing OTP delivery across regions | Rent one number per country in the same run |
| Cost matters and the country does not | Compare that service’s price across countries |
| Two Serbian activations in a row refunded with no SMS | Try the same service in another country |
The process is the same in every country. The guides for Belgium and Denmark use the same steps, so you can switch from Serbia in under a minute without learning anything new.
What should you do when no SMS arrives on your Serbia number?
Most missing codes come down to four causes: a formatting error, a slow sender, a number the service has seen too often, or a service that rejects the number type. Work through these checks in order.
- Confirm the number in the form matches the +381 format the site expects.
- Wait for the activation window to run out without requesting codes over and over.
- Let the automatic cancel and refund go through.
- Rent a fresh number, try a different service option, or switch countries.
Check the number format the sign-up form expects
Serbian mobile numbers begin with 6 after the country code. Written locally they start with 06, so the full international version is +381 6x followed by the subscriber digits. The most common mistake is keeping the leading 0 after +381. If the form has a separate country picker set to Serbia, type only the digits after +381. If it has a single free-text field, paste the full number with +381. A wrong digit sends the OTP to a stranger, and you will never see it.
Let the timer run out and the refund land on your balance
Every MarioSMS number has a timer. Most codes show up in the app or dashboard within a minute, but some senders queue their messages. Avoid clicking “resend” five times in 30 seconds, because many services rate-limit repeat requests and stop sending. If the window closes with no SMS, the activation cancels and the full price goes back to your balance automatically. You don’t need to open a ticket or ask for it.
Retry with a new number or another country
Once the refund lands, rent a new Serbian number for the same service. Each rental is a different line, so a number one platform has seen before does not affect the next one. If that attempt also expires, try a different service option where the app lists one, or pick another country from the 35+ in stock. Prices start at $0.04 and vary by country, so switching countries can also lower the cost.
Signs the service is blocking the number type, not the network
Look at what happens when you submit the number. If the form rejects it right away with “invalid number” or “this number cannot be used,” the service screened the number type before sending anything, and the Serbian network never got a message. If the form accepts the number and shows “code sent” but nothing arrives on two or three fresh numbers, the platform is probably filtering silently. Changing country is the better fix in both cases. A non-VoIP number from a different country often gets through a filter that held back every Serbian attempt.
What are the legitimate limits of using a rented Serbia number?
A rented Serbia number covers one verification. You get one code during the activation window, and once that window ends you can’t use the number again. Most of the limits follow from that. The MarioSMS acceptable use policy allows privacy hygiene, second accounts with a legitimate reason, and QA or OTP testing. It does not allow evading a ban or impersonating another person or business.
Uses that fit a one-time number
- Keeping your personal number off a marketplace, forum or dating app you are only trying out.
- Opening a second account you have a real reason for, such as keeping a work profile separate from a personal one on the same service.
- Testing your own app’s OTP flow with a Serbian number. You can check that the code arrives, that the +381 prefix parses correctly and that the message text renders properly in your template.
- Seeing how a service handles Serbian sign-ups before you launch in that market.
Each of these is finished once the code is used. If you lose the number later, nothing important depends on it.
Some uses stay off-limits whatever the country. You can’t use a rented number to re-register after a platform banned your account or to create accounts in someone else’s name. The same applies to any sign-up meant to mislead the people on the other side.
Accounts that need a number you keep
Some accounts send a new code months later, for password resets, logins from a new device or two-factor authentication prompts. By then the rented number is gone, so that code never reaches you. Don’t attach a one-time Serbia number to your main email, a work admin account or any account you can’t afford to lose. For those, use a SIM card you own. Alternatively, set up an authenticator app as the recovery method and remove the rented number from the account right after sign-up.
Serbia phone number for SMS: quick answers
How much does a Serbia number for SMS cost?
MarioSMS prices start at $0.04 per number, and the exact price depends on the service you pick and the country. A Serbia number for one app can cost more or less than one for another app. The current price for each service is listed on the Serbia numbers page and in the app before you pay, so you see the cost before you rent.
How long does the code take to arrive?
Most codes show up in the MarioSMS app or web dashboard within a minute of the service sending them. If the code takes longer, the cause is usually on the sending side, such as a rate limit or a delayed queue. Keep the activation open and watch the timer. You don’t need to refresh the number or rent a second one right away.
Can I receive a second code on the same number?
A MarioSMS rental covers one verification at a time. The number belongs to you only while its activation window is open. Once that window closes, the number is no longer yours. If the service asks for a new code days or weeks later, that SMS will not reach you. In that case you need to rent a new number and finish a fresh verification.
Do I get my money back if the SMS never arrives?
Yes. Every number comes with a timer. If the timer runs out and no SMS has arrived, the activation cancels and the full price goes back to your MarioSMS balance automatically. You don’t need to open a ticket or ask for the refund. You can spend the refunded balance on another Serbia number or try a different country.
Can I use a Serbian number while I am outside Serbia?
Yes. The SMS goes to the Serbian number on the mobile network, and MarioSMS shows the code in your app or dashboard. Your own location doesn’t affect delivery, so you could be in Lisbon or Toronto and still read the code on your phone or laptop. The service you are signing up for may run its own checks, and those are separate from SMS delivery.
Can developers automate Serbia numbers for OTP testing?
Yes. MarioSMS has a REST API with example code in Python, Node.js, Go and PHP. A QA script can request a Serbia number, start the sign-up flow under test, poll for the OTP and check that the code arrives and is formatted correctly. This lets you test a Serbia sign-up flow without buying a local SIM card for each test run.
Which payment methods can I use to top up?
You can top up your MarioSMS balance by card or with crypto. Each rental is paid from that balance. Refunds for numbers that never get an SMS also go back to that balance. A $1 top-up covers up to 25 rentals at the $0.04 starting price, though most Serbia services cost more than the minimum.