So I have an iPhone 4S which overall works great. But I'm curious if the newer iPhone 5, 5C or 5S have louder internal speakers? I often now use my iPhone at work to listen to music while I'm in the dairy cooler (I work at a grocery store). Now bear in mind that their are fans going in the cooler to keep things cold. But even so the 4S even at it's loudest volume sounds pretty quiet. Can anyone vouch if the newer iPhones have a louder peak volume level? My co-worker has an Android phone (I think Samsung) which is definitely louder then my iPhone 4S.