I am looking at getting an iPhone not because its trendy or anything like that, being that i never have even owned an ipod. What I'm generally looking at it for is because i like the idea of just a touch screen without buttons. I'm in construction and from time to time my job has me in very dusty environments. I can always put my phone away, but i'd rather not. I've never seen an iPhone in real life but from what i gather is that it doesn't have too many openings? Thus dust will not be a big issue with it? Even then, is there a case which would completely enclose it? Thanks in advance.