Cingular Wireless and Motorola (MOT) Thursday are expected to unveil an always-on data service that will send scrolling text and images to the bottom of cell phone screens. Cingular, operated by SBC Communications (SBC) and BellSouth, (BLS) will sell the service under the Live Ticker name. The feature will work with a new phone from Motorola. The move is part of a broader upgrade of Cingular's wireless portal — the screen that guides mobile phone users to entertainment and products. The company aims to make mobile Web browsing easier and quicker, and boost its revenue in the process. The Live...