Does the iphone 5s A1533 works at GSM and CDMA?

My IPhone Was Purchased From USA.

CDMA does not use a SIM card for its network connection information (only for LTE data connection). So a CDMA iPhone has to be pre-programmed for a specific CDMA network, and will only ever work on that one CDMA carriers network.
So if you have a USA CDMA A1533 it will only ever work on the specific USA CDMA carrier it was sold for. If its GSM SIM slot is unlocked, then it will work with other GSM carriers, but it will never connect to any CDMA carrier other then that one carrier it was pre-programmed for.
The GSM only A1533 (AT&T and T-Mobile) has no CDMA capability at all.

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Does the iphone 5s A1533 works at GSM and CDMA?

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