Comment Tracfone (Score 4, Informative) 294
I have a Tracfone, and like it pretty well.
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For US$20, I get 90 days + 120 minutes (+ usually a bonus 20 minutes). If you need more minutes, they're not that expensive.
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You have your choice of phones. You can get a Smart Phone if you want, but you can also get a relatively primitive phone for US$20. I've got one of the cheaper ones. Supports texting (although I've only used that a little bit) and web browsing.
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Best of all, it's pay-as-you-go, and so all it takes to "opt out" is to stop buying renewal time.