Call a Skype for Business (Lync) contact
To call a contact who’s on Skype for Business (Lync), tap the Contacts icon, second icon from the left.
Find the person in your Contacts list, or tap the Search icon at the top and type their name in the search box.
When you find the contact, tap their name, and then tap the Phone icon. This will call the person on Skype for Business (Lync).
Depending on how you set your VoIP call options, when you make a call it could use Wi-Fi or your cellular data plan. For more information, go to Manage Wi-Fi for VoIP options.
Watch an introduction to using Skype for Business (Lync) on your Android Phone
Watch this short video to learn how to use Skype for Business (Lync) to IM, make a call, and join a meeting on your Android Phone.