Go to cat.eduroam.org
Verify that "Institute for Advanced Study" is listed as the selected institution. And then click the "Do you have an account ..." button.
Click the "Download installer for Apple iOS mobile devices (iOS 7 and above)" button.
Install the eduroam Profile by clicking the "Install" button.
Type in the password of the iOS device to install the certificate.
Read through the Consent pages. Click the "Next" button on the first page. Click "Install" twice on the second page.
Enter your IAS email credentials (example, email@example.com) and click"Next."
Type in the password associated with your IAS username. Click "Next".
Click "Done" to complete the installation.