No. You can use only one 4g sim card in this phone.
Yes, Tecno i3 is a true 4g VoLTE mobile phone.
Tecno i3 standard box package includes Mobile Phone (with battery), USB Power Adapter, USB Cable, Free Screen Guard, Free Back Cover, Earphone, User Manual, Sim Ejector Pin and Warranty card.
No. Tecno i3 do not have Gyroscope sensor.