A photo posted by flickr user Jeff Croft shows that his iPhone has a sound icon on its ring/silent switch. According to an email Croft sent to Mac blogger John Gruber, the iPhone was purchased on June 29 in Lawrence, Kansas, so the icon is not a recent addition. Several other iPhone owners have commented on the photo, claiming their early-run units have sound icons as well, including one owner who provided a comparison shot of his iPhone, which…
