Some people have experienced an issue with viewing USATF certificates from certifiedroadraces.com on an iPhone. They have reported that when a link to a certificate is tapped, only the first page of the certificate appears. This does not seem to be a problem with Android phones, only iPhones.
We'd be interested in hearing what people have experienced when trying to view certificates on a phone, both iPhone and Android.
Also, Justin Kuo has found a work-around if you are experiencing this type of problem with your iPhone. (see link below)
If you have experienced this problem in the past, and found a different, and maybe simpler, solution to the problem, please post.