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Get Your UK Number

Why am I not receiving verification codes?

In most cases, the issue is not with the number itself, but with the platform not sending the code, blocking delivery, or triggering risk control based on your environment.

  1. 1

    Check OSIM test messages

    If an OSIM test SMS arrives successfully, the assigned UK SIM number is working correctly.

  2. 2

    Verify if the platform actually sends the code

    Many platforms silently block sending without showing a clear error message.

  3. 3

    Check your environment

    Review IP quality, browser setup, device fingerprint, and request behaviour.

  4. 4

    Still not working?

    Use support for complex platform restrictions and advanced cases.

1. The platform did not send the code

This is the most common scenario. Platforms often block sending when detecting suspicious activity such as IP quality, device fingerprinting, repeated requests, or unsupported account patterns.

2. IP or location triggered risk control

VPNs, proxies, and data-center IPs may cause platforms to reject sending SMS, even when the number itself is valid.

3. Browser or device environment issues

Platforms may detect browser fingerprinting, blocked cookies, automation patterns, or unusual device switching.

4. Too many repeated requests

Requesting codes multiple times in a short period may trigger cooldowns, temporary blocking, or silent delivery suppression.

5. Platform restrictions on number ranges

Some platforms apply stricter filters to certain countries, operators, or number ranges. This is beyond OSIM control.

6. How to confirm the number is working

If OSIM test messages are received but platform verification codes are not, the number is functioning and the issue is likely on the platform side.

Recommended troubleshooting steps

  • Try a different browser or incognito mode.
  • Switch to a cleaner residential or mobile IP.
  • Avoid repeated requests within a short timeframe.
  • Double-check the number format before retrying.
  • Wait before requesting another code from the same platform.

If OSIM test SMS works

This confirms the assigned UK SIM number is operational. The issue is most likely due to the third-party platform risk controls, not the number itself.

Still unable to verify after multiple attempts?

Support can help review complex verification scenarios and suggest a safer retry path.

Get Support View FAQ