No. You can use only one 4g sim card in this phone.
Tecno i3 comes with 3050 mAh non-removable battery, which can last a day's usage easily.
Yes, Tecno i3 does have the front camera flash.
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.