Straight Talk 4G LTE iPhone 5c?

I bought an AT&T iPhone 5c and I'm using it with Straight Talk. I have the AT&T compatible SIM card from Straight Talk. My phone shows a 3G connection and I don't have the option to edit my APN or anything like that. How do I get a 4G LTE connection on my phone?

*Phone is LTE capable
* SIM card is LTE capable

Have you connected to iTunes and updated the carrier settings?

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