That notifies you that the text message contains a link whether it be a webpage, coordinates, or a phone number. If you click the text in blue (the links) then an app, in those cases; phone and/or browser, will open.
Blue Link Security is an Idaho Assumed Business Name filed on March 30, 2010. The company's filing status is listed as Active-Current and its File Number is 421277 . The company's principal address is 1511 Normal Ave, Burley, ID 83318 and its mailing address is 1511 Normal Ave, Burley, ID 83318.