I recently helped a friend activate her iPhone 5. She used to have an iPhone 4S which I helped her do a backup on my Macbook. After backing up her iPhone 4S, I restored her iPhone 5 with the backup. Because her SIM card was not the correct size, I used my own SIM card to activate the phone as well.
But now there is a very weird issue where if she downloads certain apps from the App Store, it would ask for my Apple ID credentials instead of her's. I tried signing out of the App Store and having her sign in. But every time I download a certain app, it keeps asking for my credentials. Very strange.
Any one know of how to fix this?
PS: iCloud is also signed in with her credentials.