I called Apple to purchase Apple Care Plus for my new iPhone 5S. To complete the process, the Apple rep sent me a text message containing a link to perform a diagnostic test on my iPhone. The address for the link began with diag// instead of http//. I was unable to activate the link using VoiceOver and iOS 7.03.
As a work around, Apple sent me a link to perform the diagnostic test by email instead of text message. I was able to complete the diagnostic test from the email.
If you plan to purchase Apple Care Plus or need to perform a diagnostic test during a trouble shooting session with Apple, suggest that they send you the link via email rather than by text message.
The apple rep was able to duplicate my problem. He will esculate the problem. Essentially, VoiceOver identified the diag// address as a link, but did not open the link when I double tapped on the link.