Yes, Nokia 7 Plus does have the headphone jack, which is located on the top panel of the phone.
Yes, Nokia 7 Plus in-the-box accessories include a pair of an earphone as well.
No. Nokia 7 Plus does not have the Dolby audio.
No. Nokia 7 Plus can support only 2G, 3G & 4G network. It does not support 5G network.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.