The standard packaging of Comio S1 includes - Mobile phone (with battery), USB Cable, USB Power Adapter, Ear Phone, User Manual, Warranty Card, Sim Ejector Tool, Screen Protection Film & a Free Back Cover.
No. Comio S1 does not have the removable battery.
Yes, Comio S1 does have the VoLTE support for Airtel.
Comio S1 is equipped with latest Android 7.0 Nougat.