CAN A UNLOCKED IPHONE 5S OR 5C BE ACTIVATED TO BOOST MOBILE?

I'm BUYING A FACTORY UNLOCKED IPHONE 5S BUT I ALREADY HAVE AN ACCOUNT WITH BOOST MOBILE CAN A UNLOCKED IPHONE 5S OR 5C BE CONNECTED TO BOOST MOBILE IF So HOW? CAN I JUST PURCHASE THE UNLOCKED PHONE AND PUT IN A BOOST SIM CARD?

No,
Because unlocked iPhones are GSM phones and Boost Mobile uses a CDMA network because it's a MVNO (and owned) by Sprint. You could, however, take that unlocked iPhone and activate it on a GSM carrier such as AT&T or T-Mobile. CDMA and GSM are not compatible with each other.

P.S. Don't use Caps, that indicates you're shouting on the internet.

You have asked twice. I think it is sufficient to ask once.
Unlocked iPhones can be connected to any carrier. Just check the GSM/CDMA compatibility

1st off, all caps not necessary.

Boost Mobile is a CDMA carrier, not GSM where unlocked phones matter. As far as getting one on that network it would be a matter of if they would or not.

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