As long as you follow the Opt In rule.
The opt-in for all short code programs must comply with all legal and regulatory requirements, including the
Telephone Consumer Protection Act, 47 U.S.C. § 227, and the Federal Communication Commission’s rules under
47 C.F.R. § 64.1200. For example, the express written consent obtained for any program that is “telemarketing”
(as defined by 47 C.F.R. § 64.1200(f)(14)) must, unless exempt from the requirement, include the elements of
“prior express written consent” set forth in 47 C.F.R. § 64.1200(f)(8).
Confused? Me too.
Visit http://slideshare.net/victoriaroberts/optinout_rule for a visual representation of above legal language.