Because Telcat turned off the auto-dial function. When the computer is connected, you need to dial up the connection on the PC to get online. And cell phones can't dial. The current solutions are, crack or swipe the telecom cat. It's a lot of trouble, and most people don't understand. Or, buy a wireless router. Set automatic dialing on the wireless router. Connect your phone to a wireless router (not a wireless cat) to surf the Internet.