If I Unlock my iPhone 5 will I be able to access APN settings?

I'm using an att iphone 5 on ios7 with straight talk. But I can't seem to access apn settings and I don't have a t-mobile sim to do the sim swap.

I think the Straight Talk, has AT&T as well as T-Mobile compatible SIM cards for iPhone. So if your current SIM card is AT&T compatible, you do not need to worry about APN settings because it uses AT&T network settings by default.

When and if you put a t-mobile compatible SIM card, and if your iPhone is unlocked, then APN settings can be changed.

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