I own a dated motorola modem and i want to know if it can work on any internet so that i could play xbox live?
Answers:
yes itll ^^ Not if it's an analogue modem.
You need a broadband modem to be exact compatible with your broadband ISP (yes, you also requirement broadband supplied to play online) and the modem will require at least 1 ethernet RJ45 port, USB is no angelic for the Xbox 360/Xbox.