{"id":"INC-twilio-w874yx5qwkqc","kind":"incident","aliases":[],"related":[],"title":"Twilio: Voice Call Failures from a Subset of Twilio Phone Numbers to T-Mobile United States","description":"Twilio customers may be experiencing voice call failures from a subset of Twilio Phone Numbers to T-Mobile network subscribers in the United States. Our team has identified the cause, and is working to resolve the issue. We will provide another update in 1 hour or as soon as more information becomes available.","summary":null,"severity":"medium","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"Twilio","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["incident","ops","sms","twilio","vendor"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-10-29T01:34:44+00:00","first_seen_at":"2026-10-29T01:36:49+00:00","triaged_at":"2026-10-29T01:37:35+00:00","updated_at":"2026-10-29T01:44:30+00:00","category":"vendor","confidence":null,"triage":null,"analyst_status":null,"analyst_note":null,"search":"'1':72C 'anoth':69C 'avail':81C 'becom':80C 'call':3A,34C 'caus':58C 'custom':29C 'experienc':32C 'failur':4A,35C 'hour':73C 'identifi':56C 'inc':19A 'inc-twilio-w874yx5qwkqc':18A 'incid':23B 'inform':79C 'issu':65C 'may':30C 'mobil':15A,46C 'network':47C 'number':11A,42C 'op':24B 'phone':10A,41C 'provid':68C 'resolv':63C 'sms':25B 'soon':76C 'state':17A,52C 'subscrib':48C 'subset':7A,38C 't-mobil':13A,44C 'team':54C 'twilio':1A,9A,20A,22A,26B,28C,40C 'unit':16A,51C 'updat':70C 'vendor':27B 'voic':2A,33C 'w874yx5qwkqc':21A 'work':61C","nicknames":[],"mitigations":[],"who_affected":null,"tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-29T01:34:44+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"statuspage","external_id":"twilio:w874yx5qwkqc","url":"https://stspg.io/h222bhk6xb0k","severity":"medium","published_at":"2026-10-29T01:34:44+00:00","modified_at":"2026-10-29T02:58:01+00:00","first_seen_at":"2026-10-29T01:36:49+00:00","fetched_at":"2026-10-29T03:39:40+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}