From a Common Cause IL press release:

Common Cause Illinois (CC/IL) in conjunction with national Common Cause has set up a toll-free “hotline” for Illinois voters to locate their polling place as well as to be able to report problems they may incur on election day while attempting to vote.

The toll free number is: 1-866-MYVOTE1 (or 1-866-698-6831) which offers assistance in Spanish as well as English. The hotline can be utilized now and through election day to locate the polling place and address for voters. On election day–November 2nd, voters can call the hotline to report voter irregularities or problems and, after reporting the problem, an attempt to connect them directly with their local election board or authority will be made. [Snip]

During the course of election day, Common Cause will attempt to monitor and identify particular problem areas or precincts and make that information available to the media and to the public.