The Skype for Business Android App will allow you to have the same functionality as you do on the Skype for Business app on your ACS computer, on your Android Device, including checking your Skype for Business Voicemail when applicable.
Open the App Store and search for Skype for Business
Download and Install the app.
Click OK (or Don't Allow) when promted "Skype for Business would like to access your contacts."
iOS device may also ask for "Skype for Business would like to access your microphone/camera/pictures" depending on whether you will be calling, video-chatting, or sharing images.
Type you ACS email address in the Sign-In Address field (ex. Jane.Doe@cancer.org).
Type your network password in the Password field.
Tap the Advanced Settings link.
AutoDetectServer should be set to On.
Tap the Sign In button
On the "Welcome" screen tap Next.
On the Manage Data Use screen, select On for "Require WiFI for VOIP calls" and "Require WiFi for Video calls."
Type your mobile phone number and tap Next.
Choose your preference -Yes or No - when prompted to change call fowarding setting.
Tap Done on the "You're All Set" screen.