Yes, Nokia 3310 keypad is backlit enabled.
Yes, Nokia 3310 does have vibration function.
No. You cannot download whatsapp in Nokia 3310.
Yes, Nokia 3310 comes pre-loaded with Opera browser. But the speed will not be high as it works maximum on 2.5G network.
Nokia 3310 works with Normal sim cards.
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.