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Why You're Not Receiving OTP Codes on a Virtual Number — and How to Fix It

A complete guide to the reasons behind SMS verification failures and proven ways to resolve them.

OTP (One-Time Password) is a single-use code that services send to your phone number to confirm a login or registration. Technically, delivering an SMS to a physical number (via SIM card) and to a virtual number (operating over the internet) is identical — there is no difference in the delivery mechanism.

Key takeaway: if you didn't receive an OTP code, it means only one thing — the service deliberately did not send it to your number. The issue always lies on the service's side, not with Numgo.

Why does this happen? Large platforms actively fight fraud, spam, and fake account creation. On top of that, sending SMS messages is expensive — for major services, monthly SMS verification costs can run into the millions of dollars. As a result, companies apply various algorithmic filters that may block code delivery to your number.

Below are all the common causes and concrete steps to fix them.

Reasons OTP Codes Are Blocked

Local (Regional) Phone Number

Some services treat numbers tied to a specific region or state as landline numbers — meaning they don't support SMS. This is especially common with US and Canadian numbers, where mobile and fixed-line numbers share the same country code but are classified differently by carriers.

Use mobile numbers from other countries — such as the UK, Poland, or Australia. They don't have this distinction and are accepted by the vast majority of services without issues.

Using an Unreliable VPN or Proxy

Free and cheap VPN services rely on shared IP addresses that are frequently blacklisted due to mass spam or abuse by other users on the same server. When a site detects such an IP, it automatically blocks code delivery.

Use a reputable paid VPN with a dedicated IP address — or skip the VPN entirely and connect with your real IP.

Country Mismatch Between Your Number and Location

Many services check whether the country of your phone number matches the country of your IP address. If you're registering a Canadian number while physically located in Brazil, the system flags this as suspicious behavior and withholds the code.

Use a VPN or proxy with an IP address from the same country as your virtual number. The number's country and your connection country must match.

Registering from a Desktop Device

Some messengers and social networks — especially those originally built as mobile-only apps — do not send OTP codes when you register through a desktop browser. This is a common cause of issues with Telegram, Instagram, Snapchat, and similar services.

Number Detected as VoIP (Virtual)

Most virtual numbers can be easily identified as VoIP through carrier database lookups (HLR queries). For banks, payment platforms (PayPal, Revolut, Stripe), and other financial services, accepting codes on VoIP numbers is deliberately disabled as a security requirement.

How detectable a number is depends on the country and provider. US, Canadian, and Czech numbers are almost always flagged as virtual. Numbers from certain other countries are much harder to identify.

For maximum compatibility, use numbers from Poland, the UK, Hong Kong, or Finland — they are far less likely to be detected as virtual. Also be sure to check service availability on our supported platforms page before purchasing a number.

Shadow Ban on Your Device or IP Address

Your IP address, browser, or device may have been quietly added to a blacklist due to spam, multiple registrations, or other suspicious activity in the past. Services don't announce this — everything appears to work normally, but codes simply never arrive.

A shadow ban can only be identified indirectly — for example, if codes stop coming even after switching to a different number and retrying.

Try a different device, a different browser (in incognito mode), and a different network (e.g. switch from Wi-Fi to mobile data). A reputable VPN with a clean IP may also help.

Too Many Requests in a Short Period

Most services limit how many OTP codes can be requested within a given time window. If you've made several attempts in a row — even with different numbers — the system may temporarily block further requests for your account or IP.

Wait 30–60 minutes before trying again. Avoid requesting a new code more than once every few minutes.

Quick Checklist

✓Check service availability on the supported platforms page before purchasing a number
✓Use a mobile number (e.g. UK, PL, AU) rather than a local regional one
✓Make sure your IP address country matches the country of your number
✓Use a reliable paid VPN with a dedicated or clean IP address
✓Register from a mobile device, not a desktop browser
✓If it fails — try a new browser, incognito mode, or a different network
✓Don't request codes too frequently — allow some time between attempts

⚠If none of the above has helped and codes are still not arriving — contact the support team of the service in question directly. Only they can confirm whether there are restrictions on your account or IP, or explain why a specific number type is not accepted.