No. Nokia 3310 supports only 2G network. So, you cannot use only 4g sim card - Jio sim in this phone.
You can record vidoes in VGA resolution in Nokia 3310.
Yes, just like old Nokia 3310 - you will be able to replace both the covers and you can even create your custoised covers.
No. Nokia 3310 cannot be connected with WiFi.
Nokia 3310 Dual Sim variant comes with Mobile Phone, Battery, USB Micro Charger, Earphone and Quick Start Guide as in-the-box accessories.
There are a few things that do bring back the feeling of owning an original Nokia 3310, such as the classic Nokia ringtone, the physical buttons, the tiny body, and solid build quality.
You can buy other feature phones for less than this, and the new Nokia 3310 doesn't justify the extra outlay over the simple nostalgia card it's playing.