Make sure you've configured your account, such as purchasing a number, creating a messaging profile, and associating that messaging profile with that number.
First of all, there is no provision on the Telnyx portal where you can receive the SMS.
In order to receive SMS on your Telnyx purchased number, you need to attach a webhook to the number's respective messaging profile.
You can find more details about Webhook in the below section of this article.
So let's take this example DID which is connected to a Telnyx messaging profile.
Now in the messaging profile section, you need to attach a webhook as highlighted in the yellow box
Webhook can be customized and has to be set up by the customer, however, for this demo, we have generated a webhook from this website https://webhook.site/
Once the webhook is saved in the messaging profile, the content of your incoming SMS to Telnyx number can be seen in the webhook.
The below image shows SMS was sent to the Telnyx number i.e. +13125790011 with all the other details.
Video demo showing how to receive SMS on your Telnyx Number
Kudos! now you know how to receive SMS on your Telnyx number.
More details: Developer's documents https://developers.telnyx.com/docs/v2/messaging/quickstarts/receiving-sms-and-mms
More details: What are webhook?