Pre-Paid Service and SIM Question

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http://forums.androidcentral.com – So here in Iowa, I have read that TMobile coverage is best. The next best is Straight Talk, but I guess the coverage has me worried.... What are my options coverage wise? And what would I have to get SIM card wise, with respective carries? Spent about an hour trying to figure this out, and have just gotten a head-ache. So I guess I'm just hoping someone can help me out! :) (HowTos)