Text marketing is a powerful marketing tool.  98% of people open their texts vs. 20% opening email.  To be successful, however you need to be clear about what you are sending and get their permission.

The best way to get their permission is to have them text a keyword to you or to your list.  Just entering their phone number into your database, is not getting their permission. You need written permission from them.  If you don't get this, you could be in violation of SPAM laws.  Do your homework before starting a text campaign.