Hi shailendrafromgwalior,

If your iPhone won't turn on, you may need to plug it into to a electrical outlet using the charger and power cable that originally came with the phone for 10 - 20 minutes.  Here is some additional information.

If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
http://support.apple.com/en-gb/HT201412

If your iPhone, iPad, or iPod touch doesn't turn on

Your device might not start up correctly, or it might not respond when you press buttons. These steps can help.

 

If you see a black screen

You might need to charge your device before it can turn on. Plug in your device and let it charge for at least 10 minutes (20 minutes for iPad), then try turning it on. 

You should see a battery icon while your device is charging. If you continue to see a black screen, reset your device. 

Get more help

If you still need help after trying the steps above, contact Apple Support. 

 

Last Modified: Jan 14, 2015

I hope this information helps ....

- Judy