You can now create a contact from an unknown phone number from which you have received a text message. Once you create a contact on the basis of the unknown phone number, you can map all the text messages from the same phone number.
To view the enhancement:
Navigate to the text message section
Click on Create New
Fill in the details and click on Save
You will get a notification saying:
Once the contact is created it will be visible in the text section too.
If you navigate to the contact section, you will find all the text messages related to this number in the Communications section.
If there are duplicate contacts for the same number, then all the text messages from the particular number will be mapped under the newly created contact.