Shared temporary SMS numbers
VNumbr vs OnlineSIM: a OnlineSIM alternative
OnlineSIM is built around renting a number, from a shared pool, just long enough to catch one incoming code. That model is cheap for a single verification but means the number was likely used by other renters before you and may be again afterwards. VNumbr takes the opposite approach: one number assigned only to your account, for as long as you keep renewing it.
Written and maintained by the VNumbr team · Last updated 24 September 2026
Key points
- OnlineSIM: shared temporary sms numbers.
- VNumbr: real-carrier numbers you can keep, plus per-use OTP numbers, paid in crypto.
- Details such as prices change often, so check each provider directly before deciding.
Side by side
| VNumbr | OnlineSIM | |
|---|---|---|
| Number type | Real mobile-carrier numbers via our carrier partner | Shared, short-term rented numbers |
| Countries | Countries shown live in the catalog | Large pool advertised - availability varies by service |
| How you pay | Cryptocurrency (Cryptomus, NOWPayments) or wallet balance | Balance top-ups, including cryptocurrency |
| Getting started | Email signup, pay by crypto or wallet balance | Account signup - check their current terms |
| Keeping the number | Yes, for as long as you renew it (monthly or yearly) | No - numbers are shared and typically reused after rental |
| Best for | Receiving SMS and 2FA codes on a number you keep | Single, low-stakes verification codes |
What OnlineSIM does well
- Very low cost for a single, one-off verification code.
- Large pool of countries and services to pick from.
- Accepts cryptocurrency, like VNumbr.
Where VNumbr fits better
Not shared with other renters
A pooled number can receive messages meant for someone else, or be reused right after you. A VNumbr number is assigned to your account alone.
Still there next time
Account recovery and repeat two-factor prompts need the same number to still exist later. A pooled activation number is gone as soon as the rental ends.
One flat price, not per code
A monthly or yearly plan replaces paying again for every single verification.
Choose OnlineSIM instead when
- You need exactly one code for an account you will never need to recover.
- Cost per activation matters more than keeping the number afterwards.
Which should you pick: OnlineSIM or VNumbr?
You need one code and never need the account again
OnlineSIM or VNumbr OTP numbers both fit. Compare current prices for your app and country.
The account uses SMS two-factor authentication
Choose a number you keep. A VNumbr permanent number stays assigned to you while you renew, so later codes keep arriving.
You want to pay with cryptocurrency and sign up with just an email
VNumbr checkout is built around that. Check OnlineSIM's current payment options if this matters to you.
You need voice calls or a full calling app
VNumbr numbers receive SMS only. If calling matters, an app built for it may suit you better.
Moving from OnlineSIM to VNumbr
- 1Buy a number in the country your account expects.
- 2Open the account you want to move and find its phone number or security settings.
- 3Add the new number and confirm it with the SMS code that arrives in your VNumbr inbox.
- 4Only after the change is confirmed, let the old OnlineSIM number lapse.
How VNumbr works
Choose a country
Pick where the number should be based. The prefix tells apps where you are.
Pay in crypto or wallet
Cryptomus, NOWPayments or your balance. Email-only signup, no ID.
Use it for verification
Enter the number where the app asks and request the SMS code.
Read it in your inbox
Messages appear in your dashboard in real time and through the API.
Common questions
Is a shared rented number as safe as a dedicated one?
No. A shared number can be reused by other renters, so anything you don't collect immediately, or any repeat message, is at risk of going to someone else. A dedicated number avoids that by design.
Does VNumbr offer pay-per-code pricing like OnlineSIM?
Yes. Alongside monthly and yearly plans, VNumbr sells single-use OTP numbers billed per activation for a one-off code.
Should I use OnlineSIM and VNumbr together?
Many people do. A per-use or app-based service can cover a quick one-off, while a VNumbr permanent number covers accounts that need codes again later. They are not mutually exclusive.
Are VNumbr numbers real mobile numbers?
Yes. They are allocated on real mobile carrier networks rather than internet-based pools. Each app decides which numbers it accepts, so no provider can guarantee a result.
How do I pay and sign up at VNumbr?
Sign up with an email address, then pay with cryptocurrency through Cryptomus or NOWPayments, or from a wallet balance. No identity documents are required.
How do I switch from OnlineSIM to VNumbr?
Buy a number, register it on the account you want to move, and update the verification number inside that app while your old number still works. Only then let the old one lapse.
Just need one code, not a number to keep?
This comparison is about VNumbr's permanent numbers. VNumbr also sells single-use OTP numbers billed per activation, for a one-off verification code.
More comparisons
Try a permanent number.
Crypto checkout, keep it for as long as you renew.