Hello Sharmila,
It sounds like you need to change the country your Apple ID is set to so that you can access apps for your region. The following article should help you do that on the phone itself:
Change the country of your iTunes Store, App Store, iBooks Store, and Mac App Store account
http://support.apple.com/kb/ht6119
- Tap iTunes Store, App Store, or iBooks Store.
- At the bottom of the Featured page, tap Sign In.
If you're already signed in, skip to step 5.
- Tap Use Existing Apple ID.
- Enter your Apple ID and password and tap OK.
- Tap your Apple ID.
- Tap View Apple ID or View Account.
- Tap Country/Region.
- Tap Change Country or Region.
- Tap the Store menu and tap your country.
- Tap Next.
- Review the Terms and Conditions and Apple Privacy Policy.
- Tap Agree if you agree to the terms and conditions.
- In the prompt that appears, tap Agree.
- Select a payment method and enter your payment information.
- Enter your billing address and tap Next.
Thank you for using Apple Support Communities.
Cheers,
Sterling