Yes, you can use the 4G Jio sim card in Comio C2.
Comio C2 comes with big 4000 mAh battery. It offers talk time of up to 20 hours and standby period of about 500 hours.
No. Since Comio C2 has 4000 mAh big battery and to avoid heating issues, company has used high quality Polycarbonate body.
Yes, Comio C2 is a true 4G VoLTE mobile phone.