Watch this short video or read the guide below!
You can block unknown numbers from sending you messages.
Click on Contacts.
Select the undesired contact from the contact list.
Within the contact details page, there is a red toggle button labeled 'BLOCK'. Toggle that to green and click Save.
*It is important to note that simply deleting these messages will NOT allow you to actively block them from sending other unwanted messages. You must leave the blocked number in your contacts in order to prevent this.