Yes, Samsung Galaxy A8 Star does have the support for the portrait mode.
Yes, Samsung Galaxy A8 Star comes with a hybrid sim slot. In addition, the phone also has OTG support.
Yes, Samsung Galaxy A8 Star does have the metal frame.
Yes, you can play 4K videos on Samsung Galaxy A8 Star.
Yes, Samsung Galaxy A8 Star does have the 3.5 mm headphone jack.
Very Nice Phone But Little Expensive
Build quality is superb. Glass back is looking very elegant. Display is just amazing thanks to super AMOLED display quality. No blurring even in HD videos. Camera are superb. Front camera is just mind blowing. Battery performance is better than other Samsung mobiles. I am happy with this phone.