I know it sounds a dumb question but I am trying to get a feel for the limitations of 16, 32 or 64 Gb RAM models of the iPhone 4S. Obviously the more RAM the more music can be stored on the iPhone, but is this the only need for extra RAM? I have a 16Gb iPod so not sure I want more music on my phone. Is 16Gb sufficient for running apps etc. I am looking to upgrade my Nokia phone to an iPhone so want to make sure that I am not left wishing that I had gone for the model with the more memory in a couple of months time.