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There is an app for iPhone and iPad which some users have had success with. SLAC does not provide support for the app at this time, but you are free to make your own attempts to connect using it. Search the app store for "Cisco AnyConnect Client". Within the app, select "Add VPN Connection...". Enter vpn.slac.stanford.edu as the server address, this will be replaced with a list of the VPN servers that is automatically updated each time you connect. Other mobile devices may be able to connect when Cisco releases AnyConnect Secure Mobility clients for those platforms.
If you do not already have an account with Apple, you can obtain a free Apple ID at this URL (if you do not wish to provide a credit card, select "None" as the payment type):
https://appleid.apple.com/cgi-bin/WebObjects/MyAppleId.woa/
I'm getting periodically disconnected while I work, and I know I wasn't idle for 20 minutes
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