Making an in-app purchase on an old iphone3.
I've got a used iphone 3 and if I try to download apps from the phone I get told that my current phone needs to be upgraded to the latest version of the iOS. As the phone is an iphone3 it can only be upgraded to 4.2.1 which I have done. On the other hand, if I purchase apps using iTunes then install those same application to my iphone there is no problem. I'm trying to make an in app purchase on iKic Kanji in Context a study tool. The application works fine I just want to make the purchase.
iPhone 3G, iOS 4.2