SM-G928R4 questions

First time poster, long time user here. Just had a few questions I was hoping someone could answer. I searched and didn't see them already answered so here goes..... I have a cf rooted SM-G928R4 also unlocked by carried and I was wondering does anyone know if I could use a GSM sim card in this? I was thinking about switching over to straight talk with it. Also does anyone know of any good working custom roms for this model? Thanks

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