The plug, is the cord straight or is it at a angle

Have you looked at or opened a package of these Phillips SHE2617 headphones? There are no "interchangeable earpiece caps for a personal touch" and the package doesn't claim there is. I'm feeling misled.

100% sure they can be used with a cell phone??

What are the highest and lowest frequencies these Philips earphones will respond to? I prefer to have ones that support really low frequencies (I like a lot of bass, sue me. *lol*) The ones I have now [say they] go as low as about 8 Hz. (I need new ones though because my daughter lost the earpieces for them - they are the noise-isolation type - and I can't find any place selling only the replacement earpieces.) I would like something pretty close to that, if not even lower.