SMS or MMS messages that contain words in prohibited categories will be blocked by the system.

If you attempt to send an SMS message that contains a prohibited word or a phrase then an error message will be shown as seen in the below example:

Here is a list of the word categories that are not allowed in SMS messages:

• High-risk financial services

• Third-party lead generation services and marketing

• Debt collection or forgiveness

• "Get rich quick" schemes

• Illegal substances/articles

• Prescription drugs

• Gambling

• "S.H.A.F.T." use cases and electronic smoking devices

For more information please see the following articles: 

• Forbidden Message Categories for SMS and MMS in the US and Canada
• Can I send cannabis or CBD related messaging traffic on Twilio