No. Oppo F7 does not have wireless charging support.
Yes, Oppo F7 does have the VoLTE support. Both sim card slots support VoLTE and you can use dual VoLTE at the same time.
No. Oppo F7 does not have the USB Type C port. It has Micro USB 2.0 port.
No. Oppo F7 does not have the dual camera set up. The front camera is of 25MP and the rear camera is of 16MP.
The Oppo F7 is a good upgrade over the F5 in terms of battery life and SoC performance. The selfie camera is also easily one of the best in this phone's price range, and new additions like the Sense HDR mode and AI Beauty work well most of the time.