Yes, Nokia 7 Plus does have the hybrid sim slot. You can use either 2 sim cards or 1 sim card & 1 memory card.
Yes, Nokia 7 Plus in-the-box accessories include a pair of an earphone as well.
No. Nokia 7 Plus does not have the Optical Image Stabilization but it does have Electronic Image Stabilization.
Yes, Nokia 7 Plus does have the headphone jack, which is located on the top panel of the phone.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.