Fixing SMS/MMS Delivery Issues on T-Mobile
A server-side setting on T-Mobile's end can silently block your messages
Why weren't my texts going through on my T-Mobile number?
Sometimes T-Mobile applies a server-side setting to a line, even if you never requested it, that blocks or filters certain messages from coming through. This can prevent texts between your number and other contacts (business lines, coworkers, etc.) from being delivered, with no clear error or warning on your end.
How do I fix it?
Call 611 from your T-Mobile phone to reach customer support directly, and ask them to check your account for any messaging restrictions or server-side settings affecting SMS/MMS delivery. In many cases, it's a quick fix they can resolve on the call.
How do I know if it's actually fixed?
Send a test message to and from each affected contact or number. If messages flow both ways without delay, the issue is resolved.
Is this something I caused?
No, this can happen due to carrier-side settings applied automatically, without any action on your part. If you run into this, don't assume it's a problem with your device, app, or account settings before checking with your carrier first.
What should I do if this happens again?
Call 611 and describe the symptoms (e.g., "messages aren't sending/receiving between my number and X"). Reference that a prior server-side setting was found and removed, in case it recurs.