How to restart Sony xperia sp when it gets hang up

[nkrrish]

My phone Sony xperia SP hangs up and unable to restart the device. It is really hard to be like tat for long time. Pls anyone help me ASAP.

[Robert32]

Thank you -  I have tried this & it worked so your forum contribution has helped me as well

[Vk1986]

My phone is hanging problems and restard