ONSIM Outage History

ONSIM is up right now

ONSIM had 5 outages in the last 2 years totaling 73h 31m of downtime — averaging 0.2 incidents per month.

There were 5 ONSIM outages since November 18, 2025 totaling 73h 31m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.onsim.uk

Major July 14, 2026

14/07/2026 - Service Incident Notice - 19.30pm

Detected by Pingoru
Jul 14, 2026, 07:46 AM UTC
Resolved
Jul 14, 2026, 07:57 AM UTC
Duration
10m
Affected: VoiceDataSMS
Timeline · 1 update
  1. investigating Jul 14, 2026, 07:46 AM UTC

    We are currently aware of an issue affecting some customers' mobile services. Our upstream carrier is aware of the issue and their engineers are currently investigating the cause. We are in regular contact with them and will continue to provide updates as soon as we receive further information. At this time, we do not have an estimated time for resolution. We apologise for the inconvenience and appreciate your patience while the issue is being investigated.

Read the full incident report →

Major December 5, 2025

05/12/25 - Service Incident Notice

Detected by Pingoru
Dec 05, 2025, 08:56 AM UTC
Resolved
Dec 05, 2025, 09:23 AM UTC
Duration
26m
Affected: Portals & APISupport Desk
Timeline · 3 updates
  1. identified Dec 05, 2025, 09:14 AM UTC

    We are aware of the ongoing global Cloudflare outage, which is currently affecting a number of online services across the internet. Due to this outage, our support team is unable to respond to tickets submitted via email or through the Support Portal at this time. Please note that you can still log queries as normal, and once Cloudflare services are fully restored, our team will begin responding as quickly as possible. Additionally, this incident may cause intermittent issues accessing call recordings within the Onsim Portal. We apologise for any inconvenience this may cause and appreciate your patience while the wider Cloudflare issue is resolved.

  2. monitoring Dec 05, 2025, 09:20 AM UTC

    Cloudflare have implemented a fix for the outage affecting our services. We are currently monitoring the effects to ensure everything is fully restored. Thank you for your patience.

  3. resolved Dec 05, 2025, 09:23 AM UTC

    Cloudflare have confirmed that the outage has been fully resolved. All affected services are now operating normally. Thank you for your patience throughout this incident.

Read the full incident report →

Notice November 19, 2025

19/11/25 - Service Incident Notice

Detected by Pingoru
Nov 19, 2025, 10:55 AM UTC
Resolved
Nov 19, 2025, 12:59 PM UTC
Duration
2h 4m
Affected: VoiceDataSMS
Timeline · 4 updates
  1. investigating Nov 19, 2025, 10:55 AM UTC

    We are seeing a service degradation on the platform which is causing subscribers to de-register from the network when attempting to make calls and unable to receive inbound calls. We are only aware of this impacting iPhone devices currently. This is impacting subscribers registrations, as well as those registered and attempting to make calls over the mobile network. Subscribers using Wifi calling will not be impacted at this time.

  2. investigating Nov 19, 2025, 12:25 PM UTC

    While we are still investigating, we do not believe the issue is widespread. We will provide a further update in due course.

  3. investigating Nov 19, 2025, 12:58 PM UTC

    The issue of reported degradation was localized to a few users and resolved. We believe we are fully functional at this time.

  4. resolved Nov 19, 2025, 12:59 PM UTC

    This incident has been resolved.

Read the full incident report →

Notice November 18, 2025

18/11/25 - Service Incident Notice

Detected by Pingoru
Nov 18, 2025, 03:05 PM UTC
Resolved
Nov 19, 2025, 09:23 AM UTC
Duration
18h 17m
Affected: VoiceDataSMS
Timeline · 6 updates
  1. identified Nov 18, 2025, 03:05 PM UTC

    We are aware of an issue affecting some customers’ ability to make and receive calls, sms and use mobile data as well as device registrations. This is due to a wider problem currently impacting EE’s infrastructure, which is itself being affected by the ongoing Cloudflare outage. Our team is monitoring the situation closely and we will provide updates as soon as more information becomes available. No action is required from customers at this time and we believe it is not affecting all customer. Further updates to follow

  2. monitoring Nov 18, 2025, 03:06 PM UTC

    Update: We are seeing a marked improvement in subscriber registrations and service is returning to normal. We are still waiting on confirmation from EE that this is resolved, and we will continue to monitor closely for any further impacts.

  3. monitoring Nov 18, 2025, 04:16 PM UTC

    We have observed that registrations have now normalised, we will continue to monitor closely for any further impacts.

  4. monitoring Nov 18, 2025, 05:53 PM UTC

    No further reports of issues from ONSIM customers since the last update. Cloudflare have confirmed their systems are 'currently operating normally'. We are still waiting on confirmation from EE that this is resolved and we will continue to monitor closely for any further impact.

  5. monitoring Nov 19, 2025, 09:22 AM UTC

    We have not had any further reports of this issue and registrations and calls are operating as normal, Incident is now considered closed.

  6. resolved Nov 19, 2025, 09:23 AM UTC

    This incident has been resolved.

Read the full incident report →