Introduction
Tap your profile picture > Settings > Phone Number. Type your cell phone number.
Instructions
1) Open the Skype for Business app.
.
2) In the top left-hand corner, tap your profile picture.
NOTE: If you do not have one set up, tap the silhoutte picture in place of it.
3) Tap Settings.
4) Tap Phone Number.
5) Type your cellular phone number.
Outcome
Your mobile number has been updated in the Skype for Business app on your device.