Sinch Outage History

Sinch experienced SMS delivery issues specifically affecting the Telia network in Sweden from 07:59 to 08:38 UTC on April 22, 2026. The incident caused delayed mobile-terminated and mobile-originated messages, along with missing or late delivery receipts for SMS services in the EMEA region. A fix was implemented and monitored before the incident was fully resolved after approximately 1.1 hours.

Sinch's SMS delivery statistics system experienced temporary delays in displaying and downloading data due to high traffic volumes, affecting campaigns in France. The latency issues persisted for 31 hours before being fully resolved. Users encountered slower response times when accessing their SMS campaign statistics and reports during this period.

Sinch experienced SMS delivery issues with the Telia network in Sweden from 15:00 to 16:50 UTC on April 21, 2026. The incident caused delayed mobile-terminated and mobile-originated messages, along with missing or late delivery receipts for SMS services in the EMEA region. The issue was resolved after approximately 1.7 hours.

Sinch experienced a ticketing system issue affecting their support email that caused delayed customer support responses for 2.2 hours. Customers were advised to use the web-based ticketing portal at support.sinch.com as an alternative during the outage. The incident was resolved and normal email support functionality was restored.

Sinch's DI SMS 365 (iSMS) platform experienced potential delays in the delivery of mobile originated (MO) and mobile terminated (MT) SMS traffic, as well as delivery reports (DLR), affecting SMS 365 Operator services in the US and internationally. The issue was detected by internal monitoring systems and impacted message processing across the platform. The incident was resolved within 5 minutes (from 10:15 to 10:20 GMT on April 20th, 2026), with Sinch confirming that messages returned to normal processing without delays.

Sinch's WhatsApp messaging API experienced a major outage for 27.8 hours due to missing required fields needed to identify WhatsApp templates in API requests. The incident affected Campaigns API services across North America, Europe, and France, while WhatsApp sending through the web application remained functional. The issue was identified and resolved with a fix deployed on April 21st.

Sinch experienced delivery issues with AT&T in the United States from April 18, 2026 01:25 UTC to 05:20 UTC, lasting approximately 4 hours. The incident affected SMS services across US Toll Free, 10DLC, and ShortCode numbers, as well as US MMS services. The delivery issues were resolved after investigation and monitoring.

Sinch experienced SMS delivery issues in Cuba on the Cubacel network, causing delayed mobile-terminated and mobile-originated messages along with missing or late delivery receipts. The incident affected SMS services in the LATAM region for approximately 17.8 hours from April 18, 2026 00:23 UTC until resolution at 16:00 UTC the same day.

Sinch Engage experienced a service disruption where users were unable to create new social campaigns, with the Create button becoming unresponsive in the Social Messaging - All Campaigns section. The issue affected The Hub component and prevented campaign creation functionality for approximately 4 hours and 20 minutes. The incident was resolved after implementing a fix and monitoring the results.

Sinch experienced SMS delivery issues in Angola through the Africell network, causing delayed mobile-terminated and mobile-originated messages along with missing or late delivery receipts. The incident affected SMS services in the EMEA region for 48 minutes from 08:12 to 08:47 UTC on April 17, 2026. The service was fully restored and the incident was resolved.