Yes, Smartron SRT Phone is a dual sim 4G mobile phone. You can use 2 4G Sim cards at the same time.
Yes, you can record 4K videos on Smartron SRT Phone.
Yes, Smartron SRT Phone does support Jio video calling. SRT Phone is a true 4G VoLTE mobile phone.
Yes, Smartron has already announced that they are going to release Android Oreo update for SRT Phone customers in January 2018.
Yes, Smartron SRT Phone is a metal body phone. It is made of Aluminium Alloy.