iOS 6 update problem: how to switch to Indian store?

I too faced this problem after the iOS6 Upgrade. This worked for me:

1. Open the Appstore
2. Go to Featured (scroll down to bottom until you see your Apple ID)
3. Click on Apple ID
4. View Apple ID
5. Enter your Password
6. Once you login it will say your account is transferred to the respective country.

Hope this solves your problem with updates.

It seems there is some issue or may be because of security this happens with iOS 6. So nothing, just press on Appstore under settings. Press down the button with your e-mail on and choose "view Apple Id". It will automatically switch your store.

If this is still an issue after trying what's been suggested, then try signing out and sign in again using your existing Apple ID. It will automatically shift you to the relevant store. I also had similar problems after upgrading to iOS 6, but now it's working fine.