I purchased a monthly 500-minute, 500-gb plan from a kiosk. When I turn on "Data connection," the 4G icon shows at the top right of the screen (Lumia 520s don't work with LTE). However, when I try to view a web page like Google, Internet Explorer displays "Error: Cannot find server or DNS error". I haven't used my self-service account because I assumed that the kiosk tech configured everything as necessary. How do I fix this? Thanks much.