So I was casually about to unlock my 5s ahead of a trip to Europe next week when I saw the ridiculous prices they're now charging for unlocking AT&T phones. No problems, I thought, I'll just use my old out of contract 4s. The only thing is, the battery life in it is terrible, and it has a few nicks and scratches (pretty minor). I thought I'd take it to the Apple Store and ask for a new battery (which I thought would bag me a new/refurbed immaculate iPhone). After some Googling, I saw that Apple are now servicing iPhones and replacing the parts. The only thing is, I cannot find any answers on Google that completely confirm that they're doing battery replacements in the iPhone 4s or if they're still replacing the entire handset. Would appreciate a definitive answer on this. Would much rather pay $79 for a 'new battery' than $199 for a replacement 4s.