Hyphenated words at end of line!

Hi – When I am viewing my website on iPhone and IE the words are hyphenating and therefore are over two lines. I have added the following but hasn’t worked:

.post_content {
word-wrap: normal;
-webkit-hyphens: none;
-o-hyphens: none;
-moz-hyphens: none;
hyphens: none;
-ms-hyphens: none:
}