Yes, Gionee A1 Plus does have a gyroscope sensor.
Gionee A1 Plus is not a routine phone. It has a beautiful 6-Inch Full HD display & 4550 mAh battery coupled with 4GB RAM & 64GB Internal Memory. However, we feel that you can consider below as disadvantages.
01) It's bulky and tough to handle
02) It cannot record 4K videos
Yes, Gionee A1 Plus does support OTG.
Yes, Gionee A1 Plus does have a hybrid sim slot.