249049 SMS Solution Needed

We are looking for a solution where an advertiser will post alphanumeric text via there admin panel, and on the front end of the web site where potential visitors are, if they enter in their cell phone number they will receive a text message with what the advertiser typed in. We are looking to do this in a cost-effective way, not through a gateway like clickatell >> Teleflip had a technology where this was possible in which the phone number entered [login to view URL] and the SMS message was received. So again, a visitor will be on our site and type just their cell phone number in and click a button and receive the text message that an advertiser has input via their admin panel. There will be many advertisers so there will be many different text messages possibly received. Please post all questions via the PMB. We are looking for this solution to be reached within two weeks if possible