Outage in Zipwhip

SMS Delivery Delays From Twilio Short Code Numbers to US Carriers

Resolved Minor

December 01, 2025 - Started 4 months ago - Lasted about 13 hours
Official incident page

Incident Report

Due to sustained high traffic on the US carrier networks, we are currently experiencing SMS delivery issues from Twilio Short Code. Messages are queued due to capacity shortage, and customers may see delays when sending to certain US carriers. Please find the current delivery status for the major carriers below: AT&T (status - Operational) T-Mobile (status - Operational) Verizon (status - DLR Delayed) US Cellular (status - Operational) We are actively working with our carrier partners to resolve the issue, and we will provide another update in 2 hours or as soon as we have any new information to share.

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Latest Updates ( sorted recent to last )

RESOLVED 4 months ago - at 12/02/2025 06:05AM

We are no longer experiencing SMS delivery delays when sending messages to all US carrier networks. This incident has been resolved.

MONITORING 4 months ago - at 12/02/2025 02:01AM

Our monitoring shows overall improvement in carrier-side traffic congestion, and we are observing instant SMS delivery from Twilio Short Code at this time. We will continue monitoring the overall US carrier networks to ensure a full recovery. We will provide another update in 4 hours or as soon as more information becomes available.

INVESTIGATING 4 months ago - at 12/02/2025 12:52AM

Due to sustained high traffic on the US carrier networks, we are currently experiencing SMS delivery issues from Twilio Short Code. Messages are queued due to capacity shortage, and customers may see delays when sending to certain US carriers.

Please find the current delivery status for the major carriers below:

AT&T (status - Operational)
T-Mobile (status - Operational)
Verizon (status - Operational)
US Cellular (status - Operational)
Dish Network (status - Delays)
C-Spire (status - Delays)
US cell (status - Delays)
Cellcom (status - Delays)
Viaero (status - Delays)
GCI-Chat (status - Delays)

We are actively working with our carrier partners to resolve the issue, and we will provide another update in 2 hours or as soon as we have any new information to share.

INVESTIGATING 4 months ago - at 12/01/2025 10:52PM

Due to sustained high traffic on the US carrier networks, we are currently experiencing SMS delivery issues from Twilio Short Code. Messages are queued due to capacity shortage, and customers may see delays when sending to certain US carriers.

Please find the current delivery status for the major carriers below:

AT&T (status - Operational)
T-Mobile (status - Operational)
Verizon (status - Operational)
US Cellular (status - Operational)
Dish Network (status - Delays)
C-Spire (status - Delays)
US cell (status - Delays)
Cellcom (status - Delays)
Viaero (status - Delays)
GCI-Chat (status - Delays)

We are actively working with our carrier partners to resolve the issue, and we will provide another update in 2 hours or as soon as we have any new information to share.

INVESTIGATING 4 months ago - at 12/01/2025 09:15PM

Due to sustained high traffic on the US carrier networks, we are currently experiencing SMS delivery issues from Twilio Short Code. Messages are queued due to capacity shortage, and customers may see delays when sending to certain US carriers.

Please find the current delivery status for the major carriers below:

AT&T (status - Operational)
T-Mobile (status - Operational)
Verizon (status - DLR Delayed)
US Cellular (status - Operational)
Dish Network (status - Delays)
C-Spire (status - Delays)
US cell (status - Delays)
Cellcom (status - Delays)
Viaero (status - Delays)
GCI-Chat (status - Delays)

We are actively working with our carrier partners to resolve the issue, and we will provide another update in 2 hours or as soon as we have any new information to share.

INVESTIGATING 4 months ago - at 12/01/2025 07:15PM

Due to sustained high traffic on the US carrier networks, we are currently experiencing SMS delivery issues from Twilio Short Code. Messages are queued due to capacity shortage, and customers may see delays when sending to certain US carriers.

Please find the current delivery status for the major carriers below:

AT&T (status - Operational)
T-Mobile (status - Operational)
Verizon (status - DLR Delayed)
US Cellular (status - Operational)
Dish Network (status - Delays)
C-Spire (status - Delays)
US cell (status - Delays)
Cellcom (status - Delays)
Viaero (status - Delays)
GCI-Chat (status - Delays)

We are actively working with our carrier partners to resolve the issue, and we will provide another update in 2 hours or as soon as we have any new information to share.

INVESTIGATING 4 months ago - at 12/01/2025 05:54PM

Due to sustained high traffic on the US carrier networks, we are currently experiencing SMS delivery issues from Twilio Short Code. Messages are queued due to capacity shortage, and customers may see delays when sending to certain US carriers.

Please find the current delivery status for the major carriers below:

AT&T (status - DLR Delayed)
T-Mobile (status - Operational)
Verizon (status - DLR Delayed)
US Cellular (status - Operational)

We are actively working with our carrier partners to resolve the issue, and we will provide another update in 2 hours or as soon as we have any new information to share.

INVESTIGATING 4 months ago - at 12/01/2025 05:02PM

Due to sustained high traffic on the US carrier networks, we are currently experiencing SMS delivery issues from Twilio Short Code. Messages are queued due to capacity shortage, and customers may see delays when sending to certain US carriers.

Please find the current delivery status for the major carriers below:

AT&T (status - Operational)
T-Mobile (status - Operational)
Verizon (status - DLR Delayed)
US Cellular (status - Operational)

We are actively working with our carrier partners to resolve the issue, and we will provide another update in 2 hours or as soon as we have any new information to share.

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