Tecno i3 comes with the latest Android 7.0 Nougat OS. In future, you can update phone OS if the new update gets released from the company.
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. You can use only one 4g sim card in this phone.
No. Tecno i3 do not have Gyroscope sensor.