To locate the Lync 2010 for Android advanced options when you are using a Samsung Galaxy S5 mobile phone, press the button to the left of the Home button for at least three seconds, as shown in the following screen shot. The Options
button will appear in the lower-right corner. Then, tap Options
to access the advanced options.
If you are having other issues with Lync 2010 for Android on a supported Android device, please review the following Microsoft KB article before you contact Microsoft support.
How to troubleshoot issues that you may encounter when you use the Lync 2010 mobile client for Google Android