This conversation has been merged. Please reference the main conversation: Block or Text 5 Digit Numbers
It does not appear to be possible to block SPAM SMS messages sent from a short code (e.g. 78645). The block icon does not appear when displaying the message in the windows application like it would for a text from a regular number and when you try to add the short code to the list of numbers in the settings window it does not accept the number and displays the message "Extension numbers cannot be blocked". It doesn't work on the website either. It adds a 1 to the short code (178645).