The text to join campaign works great in places that you want to give more information to a potential customer or client. In return you can get their mobile information to add to your list and you can connect with them using text message marketing at a later date.
You can advertise your text-to-join campaign, just about anywhere you can reach people. - Yellow Pages
There are too many to list. Everywhere that traditional forms of advertising are displayed is a place that you can put your keyword campaigns because people almost always carry their mobile devices on them. This means that at any time, you can be reaching them with a mobile campaign.