SM-G530F - 4G sign on sim card slot but no options in the settings

I have a Samsung Galaxy Grand Prime SM-G530F which has a 2G/3G/4G sign beside of the first sim card slot but there is no option for LTE or 4G in the system's Settings.
what is the problem? what should I do?

Also it is worth noting that the NFC chip is not working, though there is an option for it in the system!

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