The Lync 2013 is available for your mobile device, we recommend this version for it's enhanced features including - voice & video over wireless, rich presence, instant messaging, conferencing from a single, easy-to-use interface.
Note: Microsoft Lync is currently not available for Android tablets.
Once you have install the app, open it to sign in.
Your sign-in name is your RHUL email address, such as FirstName.LastName@rhul.ac.uk
Images below show the Lync 2013 sign-in screen on a Android phone.