Phone numbers different color on iOS wordpress
Have a look at phone-numbers-changing-to-unwanted-gray-color-on-iphone-and-ipad post.

It is possible that you have the same issue where you link color is what is determining the iOS color and you may need to setup a Browser Specific CSS plugin according to the post



Update: 9th Nov 2014

I found another post update-banning-blue-links-on-ios-devices which effected a change for  a test phone link on my wordpress site.

Although the numbers where a light blue because they are being data detected.

This solution may or may not help you figure your issue.

In the post they offer various ways of achieving a change with various results.

Their favourite is the option 5.

Which is surrounding the number in a custom span class.

Declare you css classes as normal in your head:

.appleLinksWhite a {color: #ffffff !important; text-decoration: underline;} 
.appleLinksBlack a {color: #000000 !important; text-decoration: none;}
.appleLinksRed a {color: #FF0000 !important; text-decoration: none;}


and the surround the number in the chosen class

contact:&lt;span class="appleLinksRed"&gt; 0205 992 9921&lt;/span&gt;