Yesterday a friend of mine called me asking if I had a solution for a problem he had with his iphone. While he came to my office I browsed the forum and found that many users had problems with lint in the earphone jack making the iphone think that an earphone was connected.
Here is a thread about the problem:
So, after solving my friend problem using some canned air and many plug-unplugs I decided to make a jack cover, and this is the result:
Its made in acrylic and has a small perimetral dent to allow easy extraction.