Cricket's Chicago network runs on AWS/1700MHz spectrum, which the iPhone does not support. I'm pretty sure the iPhone will not be available on Cricket in Chicago, unless you bought it elsewhere and are roaming. See related article:
http://www.suntimes.com/12894810-761...n-chicago.html
I saw you recently posted that you had a Verizon iPhone 4 - if you still do, you could get it ported to Page Plus which uses Verizon, it's $55 unlimited with 2GB data. Or get a AT&T iPhone and use Straight Talk's $45 plan.
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