No, the Samsung Galaxy F12 5G is not a 5G phone. It supports 2G, 3G and 4G network.
Yes, the Galaxy F12 ships with OneUI firmware. It was released in April of 2022 and came with Android 11-based One UI 3.1 OS pre-installed. However, in August of that same year, Samsung updated the phone to Android 12 OS topped with One UI 4.1 user interface.
The Samsung Galaxy F12 weighs 221 g.
Samsung Galaxy A23 5G price in India starts from Rs.26,016.