A portable USB device that enables mobile Internet accessing service is disclosed. The portable USB can be plugged into an external USB port of a computing device for enabling the Internet accessing service. Subsequent to receiving the Internet accessing service by the computing device via the portable USB device, the computing device may further share the Internet with other wireless devices over a local area network (e.g., network compatible, at least partly, with IEEE 802 standards). The portable USB device may include a wireless component and may further include wireless communication software or data for running at the computing device. The Internet accessing service may employ security data stored in a memory area of the portable USB device for enabling service verification or for security. The portable USB device may also be a non-wireless device connectable to a USB port for enabling phone calling.