Can do I get an iPhone 5S on Straight Talk?

I would like to have an iPhone on Straight Talk, mainly because it offers LTE now with their SIM cards. I have considered purchasing an iPhone 5C because they are explicitly sold on the Apple website as unlocked, but I know I can purchase an iPhone 5S for T-Mobile that is unactivated. My question is this: will this T-Mobile iPhone 5S arrive ready to be used with a Straight Talk SIM?

I know Straight Talk uses AT&T, I thought perhaps since AT&T and T-Mobile both use GSM networks the T-Mobile iPhone would work with the AT&T (Straight Talk) SIM.

That will work, as both AT&T and T-Mobile use the same GSM frequencies for most purposes.

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