Hi there Anurag,
Yes, there is a way to safely destroy all data from the phone. Firstly, shut down the phone. Secondly, hold down the volume up button and power button at the same time. When the logo appears, keep holding the volume button and let go of the power button. Thirdly, use the volume up and down arrows to navigate the screen. Press Wipe data/factory reset. Then press yes. Once you have done that, restart the phone and it is good as new with all the data being safely destroyed.