Our friend over on the Android blog have a recent post regarding adding a prefix to a call.
http://blogs.stthomas.edu/android/2011/04/27/ust-extension-dialing-as-easy-as-bb/
At St. Thomas, the global directory generally includes only the extension. And as such, you cannot simply call a number after searching the directory with the Contacts app on your iPhone. Luckily, there’s an app for that (a few actually) and they are free!
The one that appears best for our use is called PrefixACall.
