# More about SMS

SMS channel rules, use cases, regulations and sender registration by country.

**Language:** en
**Audience:** platform
**Translation key:** platform.sms
**Search keywords:** sms rules, sms regulations, sender registration, use cases, unicode, country restrictions, compliance
**Related pages:** /platform/es/sms, /platform/en/overview
**Help Center:** https://help.instasent.com/en/collections/3675970-more-about-sms

Reference for the SMS channel itself: definitions and rules, use cases, sample terms and privacy text, country-specific regulations (US, Canada, Spain) and sender registration.

## Guides

- [SMS channel definitions and rules](https://help.instasent.com/en/articles/6653236-sms-channel-definitions-and-rules)
- [SMS Use Cases](https://help.instasent.com/en/articles/6655683-sms-use-cases)
- [Sample Terms of Service and Privacy Policy for using the SMS channel](https://help.instasent.com/en/articles/8410073-sample-terms-of-service-and-privacy-policy-for-using-the-sms-channel)
- [How can I send SMS to USA and Canada?](https://help.instasent.com/en/articles/8456641-how-can-i-send-sms-to-usa-and-canada)
- [Forbidden Message Categories in the US and Canada](https://help.instasent.com/en/articles/8460132-forbidden-message-categories-in-the-us-and-canada)
- [Local Restrictions and Regulations](https://help.instasent.com/en/articles/6655692-local-restrictions-and-regulations)
- [SMS Sender Registry in Spain](https://help.instasent.com/en/articles/14635061-sms-sender-registry-in-spain)
- [How to Authorize Alias ​​Registration with the CNMC](https://help.instasent.com/en/articles/14817020-how-to-authorize-alias-registration-with-the-cnmc)