Event Center webinars are not viewable on an iPhone however they are viewable on iPad and android devices with an app.
To download the iPad App: https://itunes.apple.com/us/app/mobilemeetings/id1294649392?mt=8
To download the Android App: http://media01.commpartners.com/EC/1374635_MobileMeetingAndroid.apk
Please contact the Organization hosting the webinar to receive the Webinar Meeting ID to enter the meeting via the app.