To drop a user"s existing Internet connection and then dial up a new connection that offers a service (such as a video or concert) over a premium-rate phone line. Also: drop dial.
A technique used by both scrupulous (Comic Relief) and unscrupulous (porn) websites to get money from Net users without requiring a credit card. A program on the website drops the user"s internet connection and dials a new one, usually on a premium rate number.
—“Web speak,“ The Daily Telegraph, April 5, 2001
Just as broadcasters are assessing the potential of drop-dialling, so is the music industry. With MSN putting time and money into developing a website to stream concerts, it would not be surprising if MSNMusic.com introduced drop-diallers as an alternative to credit card subscriptions.
—Amy Vickers, “New media: Drop everything,“ The Guardian, March 19, 2001