Find and install Skype for Business on Play Store. Then open it.
To log into Skype for Business, type in your information like in the picture below
firstname.lastname@example.org, your password. Choose “Show Advanced Options” and type nmbu\username under “User Name”, then “Sign In”.
Then enter your devices phonenumber, then “Continue”.
Set “Sync Contacts” to “On”, then continue.
Next you will see the Start screen for Skype for Business, it should look similar this:
If you are not connected to wifi you might experience bad quality on conversations. If you wish only to accept calls when you are connected to wifi then go to “Options” to choose this. Explained in the pictures below.