Unable to send message - Message Blocking is active.

Double check something:

Open Settings ➔ Messages ➔ Send as SMS: Ensure that this is set to ON.

If the above is already set to ON then ensure that you can make and receive calls. This will tell you that the SIM card has active service. If this is the case then contact your carrier for further resolution.

Axel F.

Where are you seeing a message that SMS is blocked? SMS is a carrier feature and if you are experiencing a problem sending or receiving SMS, you need to contact your carrier to troubleshoot. There are no settings on the iPhone to control SMS.

Hi Joseph,

From your initial post, I thought that none of the SMS messages go through. Is this SMS issue only with a certain contact(s)? If the issue is with SMS messages not going through to anyone then T-Mobile is the right place to contact.

Axel F.

What do you mean by this? "some other SMS calls go through!"? What is an SMS call? The carrier controls SMS, as I said before, they have to troubleshoot it. Can you provide a screenshot of this error you are seeing that they are blocked?