Tap your profile picture > Settings > Phone Number. Type your cell phone number.

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.