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SIM Provider Service Degradation Incident Report

Incident date: 30 June 2026

Summary

Multiple devices temporarily lost mobile data connectivity because of a service degradation at the SIM card provider. During the incident, affected devices appeared offline in Control Center, so configuration and monitoring for those devices were temporarily unavailable.

Device-side operation continued normally. Communication with traffic light controllers was not affected, and events were cached locally on the devices and delivered after connectivity was restored.

Impact

  • Multiple devices were shown as offline in Control Center.
  • Device configuration and monitoring were temporarily unavailable for affected devices.

No Impact

  • Affected devices continued to operate normally.
  • Communication with traffic light controllers was not impacted.
  • Events were cached locally and delivered after connectivity was restored.

Timeline

  • 30 June 2026, 09:15 CEST: Monitoring detected a drop in connected devices.
  • 30 June 2026, 09:20 CEST: Investigation started.
  • 30 June 2026, 10:31 CEST: The SIM card provider confirmed the outage.
  • 30 June 2026, around 11:10 CEST: Affected devices were back online.

Root Cause

Affected devices could not maintain mobile data connectivity because of a service degradation at the SIM card provider. The detailed provider-side root cause is pending and will be reviewed once the SIM card provider publishes its RCA.

Resolution

The service degradation has been resolved. Affected devices reconnected automatically as mobile data connectivity became available again. Locally cached events were delivered after the connection was restored.

We continue to monitor the situation. A detailed RCA from the SIM card provider is still pending and will be reviewed once received.

Last updated: 30 June 2026, 12:47 CEST