I just updated my iPad 2 to to iOS 6 yesterday. Today when I tried to buy an app the usual way from the App Store, I got the message "Your account is not valid for use in US store. You must switch to the Indian store before purchasing." I am unable to update my old apps as well and am getting the same message. Any idea how I should switch to the Indian store?
I too faced this problem after the iOS6 Upgrade. This worked for me:
- Open the Appstore
- Go to Featured (scroll down to bottom until you see your Apple ID)
- Click on Apple ID
- View Apple ID
- Enter your Password
- Once you login it will say your account is transferred to the respective country.
Hope this solves your problem with updates.