Yes, Nokia 2 does have the 3.5 mm music jack.
Yes, Nokia 2 is a perfect combination of Alluminimum Alloy frame and solid industrial grade Polycarbonate back.
Nokia 3 has 2 dedicated sim card slots and you can use the nano size sim cards.
Yes, Nokia 2 does have the 8MP Auto Focus rear camera.
It's not a bad phone, this Nokia 2. It's just that there's only so much you can do within a budget this tight.