Yes, Samsung Galaxy J4 does have the 3.5 mm headphone jack.
Yes, Samsung Galaxy J4 does have the OTG support.
No. Samsung Galaxy J4 does not have the fast charging support. It comes with 5v with 1Amp power out-put capacity charger.
No. Samsung Galaxy J4 does not have the NFC support.
No. Samsung Galaxy J4 does not have the hybrid sim slot. It does have 2 sim slot and a dedicated MicroSD card slot. You can use MicroSD card of up to 256GB capacity.
Very Nice Display And Overall A Good Phone
The display is very nice. It beats almost all phones while using under direct sunlight. It has lot of other features also like power saving mode, front camera flash, etc.
I suggest this phone.