I've used both T-Mobile and Virgin Mobile (a highly humorous company name to use for hobby phone service...) prepaid phones in the same way. In both instances, bought the phones at a retail outlet for cash, activated online (do the activation at a public Internet cafe or something if you want to eliminate trackability down to that level), all airtime refills paid for in cash. After initial activation, all airtime refills applied directly from the hobby phone itself.
This won't totally cover your tracks if you're really, really concerned about being identified. Someone with the right resources could find out from the carrier what store the phone was sold at, and dig up store surveillance video to identify you. If you carry a "real life" phone at the same time, someone (again, with enough resources) could dig through all the cell tower records to find other phones that are *always* hitting the same towers, at the same time, as the hobby phone. Someone who was determined enough, and willing to throw enough time and money at the problem, could still identify you.
But, for the stuff most of us care about - minor LE entanglements (where they're not going to throw all that time and resources into finding someone while investigating a minor misdemeanor), snooping spouses and SO's, probably even most private detectives that might be hired by the aforementioned snooping spouses and SO's - I don't think you'd have anything to worry about...
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