# Twilio: SMS Delivery Failures to Turkey's Turkcell Network (286-01) from Unregistered Sender IDs

> Twilio status incident “SMS Delivery Failures to Turkey's Turkcell Network (286-01) from Unregistered Sender IDs” on 2021-03-22: impact minor (vendor’s label), 2.0 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/twilio/incidents/105ly1sg5rgp
Last updated: 2021-03-22T14:00:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2021-03-22 12:01 UTC · Resolved: 2021-03-22 14:00 UTC · Duration: 2.0 h
- Updates: 1
- [Vendor status page: https://status.twilio.com/incidents/105ly1sg5rgp](https://status.twilio.com/incidents/105ly1sg5rgp)
- [Company: Twilio](https://rewindex.com/company/twilio.md)

## Timeline of updates

- **resolved** 2021-03-22 14:00 UTC: We have fully investigated the SMS delivery failures when sending to the Turkcell network in Turkey with an unregistered numeric or alphanumeric sender ID. Customers should use a pre-registered alphanumeric sender ID when sending SMS to Turkey to ensure delivery. Messages that are sent to Turkey with a pre-registered alphanumeric sender ID are fully operational and not impacted. Per our documentation for Turkey SMS guidelines, alphanumeric sender ID pre-registration is required to ensure successful SMS delivery towards Turkey. To pre-register your alphanumeric sender ID, please complete the form via https://twiliodoer.secure.force.com/SenderId or reach out to Twilio Support for further assistance. This incident has been resolved.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._

## Cite this

Status incident (vendor impact label: minor) posted by Twilio, started 2021-03-22 12:01 UTC, resolved after 2.0 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/twilio/incidents/105ly1sg5rgp
- Citation: Twilio, “SMS Delivery Failures to Turkey's Turkcell Network (286-01) from Unregistered Sender IDs” (2021-03-22 12:01 UTC). Archived by Rewindex: https://rewindex.com/company/twilio/incidents/105ly1sg5rgp (CC BY 4.0).
- Markdown link: `[Twilio: SMS Delivery Failures to Turkey's Turkcell Network (286-01) from Unregistered Sender IDs (2021-03-22)](https://rewindex.com/company/twilio/incidents/105ly1sg5rgp)`


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Canonical: https://rewindex.com/company/twilio/incidents/105ly1sg5rgp · Markdown: https://rewindex.com/company/twilio/incidents/105ly1sg5rgp.md · JSON: https://rewindex.com/api/v1/companies/twilio/incidents/105ly1sg5rgp · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T16:12:12.911Z