Hello, I am having trouble replacing the earbuds that came with my 4s back in fall 2011. My originals gave out a while back, but then my dad gave me his from an ipod touch (3rd gen I think) and they worked just fine. I bought model MA814LL off eBay but the control buttons don't work. I've also tried model MB770G/A and their buttons don't work, either. I see there's also a MB770G/B. Would they work? I'd rather not pay Apple $30 for a new pair, especially in the newer style that I don't care for as much. Thanks!