No. Gionee A1 Lite is not a waterproof phone. But it is made of Aluminium Alloy and hence you may get some protection against damage.
Yes, Gionee A1 Lite is a true 4G VoLTE mobile phone.
No. During our review did not find any major heating issue. However, since the mobile phone is made of Alluminimum Alloy body and has got huge 4000 mAh battery - you may notice some heating issue while charging.
No. Gionee A1 Lite does not have dual camera.