No. It comes with a very high-quality free Back Cover.
Gionee A1 Plus has dual sim card slot of different size. You can use one micro sized sim card and another nano size sim card in this phone.
Yes, Gionee A1 Plus does have a gyroscope sensor.
Yes, Gionee A1 Plus does have quick charging. It takes less than 2 hours to fully charge its huge 4550 mAh battery.