How can I make sure that my short code campaign is compliant?

The following guidelines are based on carrier conditions of short code service and other industry standards. Your company is required to comply with these guidelines in the use of any Twilio-provided short code. Please note, each carrier reserves the right to suspend short code service for any user at any time.

Please review the compliance guidelines below to make sure that your short code advertising and messages comply with carrier requirements.

US Short Codes

What are the requirements when advertising US short codes?
What are the opt-in requirements for US short codes?
What are the requirements for short code HELP and STOP messages?
What are the requirements for a Spanish-language short code?

Canada Short Codes

What are the requirements for Canada short codes?
What are the requirements for French-language Canada short codes? 

UK Short Codes

What are the requirements for UK short codes?