How to switch my AT&T iPhone 5c to straight talk?

I have an AT&T iPhone 5c on contract but my bill is too high! So I want to switch to straight talk but how do I do it? Can I just buy a straight talk SIM card and put it in my phone?

The phone has to be unlocked to do that, and contract phones usually aren't. AT&T might unlock it, but typically carriers only do that for phones that are out of contract. If you want to get out of the contract early then you have to pay a hefty fee.

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