What is the name of the serial port on the computer which is used to exchange data with mobile devices or cell phones?

The name of the serial port depends on the computer and the operating system used. For computers with Windows operating system, the serial ports are named with a number (1,2,3,...), whereas normally for computers running Linux, serial ports are named ttyS with a number (0,1,2,...). Users with the Windows system can find the names assigned to serial ports in: Start > Settings > Control Panel > System > Hardware > Device Manager > Ports (COM LPT).