United MileagePlus is offering 500 bonus miles through Oct. 21, 2012 to members in the U.S. who sign up to receive text messages from United. To receive the bonus, you must register your Visa card, mobile phone number and agree to accept text messages at http://insideflyerus.wpengine.com/link/?6706 – You will then receive up to 10 offers via text per month and you can request to opt-out at any time by sending a text message with the word “STOP” to 81825 from your enrolled cell phone.