Yes, Tecno i3 Pro has 3.5 mm headphone jack slot.
Fingerprint sensor on Tecno i3 Pro is located on the front of the phone. Home button doubles as a fingerprint sensor.
Tecno i3 and Tecno i3 Pro are very different. The main differences are as below:
01) Tecno i3 has 2GB RAM while Tecno i3 Pro has 3GB RAM.
02) Tecno i3 does not have fingerprint sensor while Tecno i3 Pro has fingerprint sensor.
Yes, Tecno i3 Pro has a front camera flash. In addition, you can also use the display as flash.