# SMS Regulations for Canada Canada has **strict SMS marketing regulations**, and non-compliance can result in being blocked by all major networks. Businesses must fully understand these guidelines before sending SMS campaigns. ### Key Restrictions **Opt-in Requirement** * Senders must obtain **explicit opt-in consent** before sending marketing messages. * Contacts listed in the **Do Not Call Registry** cannot be messaged. **Message Content Regulations** * If an SMS contains content related to **tobacco, alcohol, or adult material**, the sender must verify that the recipient is of legal age and permitted to receive such messages. * **Targeting minors** with restricted content is strictly prohibited. **Character Limit** * SMS messages are limited to **160 characters per message**. Following these regulations ensures compliance and prevents disruptions in SMS marketing campaigns. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.satisfilabs.com/resource-center/marketing-engine/campaigns/messaging-campaigns/sms-regulations/sms-regulations-for-canada.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.