Mobile carriers now require all message senders to have a terms and conditions page for 10DLC approval. The terms and conditions page must include: 

• Brand/Company Name
• Types of messages consumers can expect to receive
• Message frequency disclosure (Example: Message frequency varies)
• Message & data rates may apply disclosure
• Customer care contact information (Text HELP for help, contact [email address] for support, etc.)
• Opt-out instructions
• Privacy Policy Link

Here is a fill in the blank example: 

Messaging Terms & Conditions
By opting in to messaging, you agree to receive text messages about _________ from [Company Name]. Message frequency varies. Message and data rates apply. For help, reply HELP or email us at [email address]. You can opt out at any time by replying STOP. [Privacy Policy Link]