# Twilio: Increased SMS Filtering to AT&T

> Twilio status incident “Increased SMS Filtering to AT&T” on 2021-10-04: impact minor (vendor’s label), 4 d, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/twilio/incidents/z6jf960l0385
Last updated: 2021-10-08T18:06:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2021-10-04 17:48 UTC · Resolved: 2021-10-08 18:06 UTC · Duration: 4 d
- Updates: 1
- [Vendor status page: https://status.twilio.com/incidents/z6jf960l0385](https://status.twilio.com/incidents/z6jf960l0385)
- [Company: Twilio](https://rewindex.com/company/twilio.md)

## Timeline of updates

- **resolved** 2021-10-08 18:06 UTC: We have investigated the issue of increased carrier filtering on SMS traffic to AT&T US from a subset of local long code numbers. It was determined that we are observing expected filtering behavior for messaging sent without a registered A2P Campaign. All systems are operational. If you experience message filtering toward AT&T on a registered A2P 10DLC Campaign, please submit a ticket to Twilio Support.

_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 2021-10-04 17:48 UTC, resolved after 4 d, 1 update(s).

- Canonical URL: https://rewindex.com/company/twilio/incidents/z6jf960l0385
- Citation: Twilio, “Increased SMS Filtering to AT&T” (2021-10-04 17:48 UTC). Archived by Rewindex: https://rewindex.com/company/twilio/incidents/z6jf960l0385 (CC BY 4.0).
- Markdown link: `[Twilio: Increased SMS Filtering to AT&T (2021-10-04)](https://rewindex.com/company/twilio/incidents/z6jf960l0385)`


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Canonical: https://rewindex.com/company/twilio/incidents/z6jf960l0385 · Markdown: https://rewindex.com/company/twilio/incidents/z6jf960l0385.md · JSON: https://rewindex.com/api/v1/companies/twilio/incidents/z6jf960l0385 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T13:41:30.422Z