Welcome to LQ, hope you like it here. There are quite a few threads on Huawei modems though I don't remember seeing the E220. Best thing would be to search those threads for clues, links to HOWTO's etc, etc first (I think your need the Eagle-USB driver): go to http://www.linuxquestions.org/questions/search.php
. Enter in "key words": huawei (watch spelling), for "Find Threads with" select: "at least" and "1" Replies, for "Find Posts from" select "Any date" and "and newer". Should be aprox 2 pages of results.