We have completed our investigation and determined that this event did result in a subset of customer's impact. We have contacted impacted customers to provide additional information about the incident.
The incident has been resolved and SMS delivery from a subset of Twilio Short Codes and Long Codes to United Wireless and Panhandle Telecommunications Systems network subscribers in the United States is operating normally.
The incident has been resolved and User Authentication Identity Gateway API failure increase and Gateway API high latency for Verizon in the United States is operating normally.
The issue affecting messaging pricing callbacks, usage notifications for Billing events and balance updates has been resolved and service is operating normally at this time.
We have fully investigated the SMS delivery receipt delays from a subset of Twilio Short Codes to T-Mobile and Verizon network subscribers in the United States, and it was determined that the impact was limited to a small set of customers, who have been contacted individually to address any concerns. All systems are operational.