I haven't used an iOS device since the iPhone 5. I am thinking of moving back to iOS after spending some time with my Nexus devices. In the mean time, I have some app coupon codes that I want to redeem. Unfortunately I don't have any other iOS devices in my house. Pretty much all of my friends are using Android and Windows Phone. I am afraid that those codes may eventually expire if I don't use them. Is it possible for me to go to the Apple Store, take one of the demo iPhone units, log into my Apple account (my account should still exist even though I haven't logged in since I sold my iPhone 5), redeem the coupon codes, or even buy apps, and then sign out of my account?