Typically, you should receive a text message within a few minutes after enrolling. However, sometimes mobile carriers experience delays that slow down text message delivery. While waiting, make sure your phone has a wireless signal. In addition, be sure you entered the correct phone number on the enrollment site. After waiting a few minutes, if you still have not received your text message, try sending the activation code. If you still do not receive a text message, contact your wireless carrier to be sure text messaging is enabled on your phone.