When I first got my phone I noticed the home button felt unusual compared to the 6+ and previous iPhones I'd used. I didn't think much of it until now because Touch ID keeps failing. I tried washing my hands, cleaning the button and re-registering the fingerprints but it keeps saying failed, try another finger. I'm thinking I should bring it back to Apple but they've no Genius appointments available at the only store we have here. Could i just walk in and try anyway? What are the chances they're have a replacement iPhone 6 Space Grey 64gb?