The major carriers in the US are all set up for 2 year contracts, which come with subsidized phones. You can - technically - go month to month, but it's not a publicized or promoted feature, and doesn't come with substantial discounts.
There are alternatives - T-Mobile just came out with a $50/unlimited month-to-month plan - and there are some smaller carriers with month-to-month options, but they're the exception.
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The major carriers in the US are all set up for 2 year contracts, which come with subsidized phones. You can - technically - go month to month, but it's not a publicized or promoted feature, and doesn't come with substantial discounts.
There are alternatives - T-Mobile just came out with a $50/unlimited month-to-month plan - and there are some smaller carriers with month-to-month options, but they're the exception.