I have my Phantom 3 4k connected with the remote control, i've calibrated for three or four times, it showing me that is ready to fly but the motors won't start.i reset everything for couple of times but no luck.Does anyone has the same issue if so do you know how I can solve it.

Well we could all try and second guess your problem, but it would be better if you post a video of what you are doing when trying to start the motors, or at very least a full detailed description.

Which of the procedures from the user manual are you using to start the motors?

Pure your not in a no fly zone?

OP.. At least tell us what the screen on DJI Go says, it always say something when the drone refuses to take off

I see that this is new to you. are you doing the CSC on your RC. In other words bringing both sticks on your RC down and to the center.