Sinch US Short Code Onboarding Overview

Thomas_James — Wed, 21 Oct 2026 16:00:55 GMT

The Sinch US Short Code Onboarding Deck and the US Short Code Onboarding Overview documents describe the process for onboarding US short codes.

Helpful Industry Resources:

Provisioning Schedule:

The below table outlines the schedule and estimate timing for provisioning/migrating short codes (note this is from the time of carrier submission):

Operator	Provisioning Schedule	Estimate Timing
Verizon Wireless	Tuesday maintenance window	1-2 Weeks
AT&T Mobility	No set provisioning cycle	1-2 Weeks
T-Mobile & MetroPCS	No set provisioning cycle	1-2 Weeks
ClearSky	No set provisioning cycle	1-2 Weeks
US Cellular	No set provisioning cycle	1-2 Weeks
Google Voice	No set provisioning cycle	3-5 Weeks
Interop	No set provisioning cycle	3-5 Weeks

Annual US Wireless Carrier Freezes

Please note the upcoming carrier freeze periods, during which major wireless carriers may pause US short code provisioning, migrations, and certifications. To help avoid delays, please plan any short code changes in advance and coordinate with your Account Manager ahead of these dates.

AT&T:

T-Mobile:
Nov. 26, 2026 - Nov. 27, 2026
Dec. 24, 2026 - Jan. 1, 2027**
** Please note that it isn't a full freeze, campaigns will not be certified but they can still be onboarded.

Verizon:
Nov. 25, 2026 - Dec. 1, 2026
Dec. 23, 2026 - Dec. 27, 2026
Dec. 30, 2026 - Jan. 3, 2027

Check back for more updates once other carriers have announced their 2026-2027 freeze dates.

article Sinch US Short Code Onboarding Overview in US Short Codes

Sinch US Short Code Onboarding Overview