The Mobile Marketing Association has released the latest version of their Consumer Best Practices Guidelines for Cross-Carrier Mobile Content Programs (in PDF format). The guidelines include information on: 

General Conduct
Advertising and Promotion
Opt-in
  Standard Rate Programs
  Premium Rate Programs
Help
Opt-out
Subscriptions
Chat
Customer Care
  Spending Cap Limits
  Bill Face
Word of Mouth Marketing
Content Specific Guidelines
  Alcohol and Tobacco
  General Content
Glossary

ceo

[Via MocoNews]