Merge pull request MicrosoftDocs#100 from jasonshave/master

Updated Set-CsMobilityPolicy description and formatting.

Author: kenwith

skype/skype-ps/skype/Set-CsMobilityPolicy.md

@@ -581,13 +581,13 @@ Accept wildcard characters: False
 ```
 
 ### -VoiceSettings
-Controls how audio is connected by mobile devices joining a meeting or a peer-to-peer call. Acceptable values are: 
+Controls how audio is connected by a mobile device joining a meeting or a peer-to-peer call. When the Skype for Business client is first run, and the user is enabled for Phone System with a Calling Plan, they are prompted to configure a call back phone number. This number is stored in settings under the **Calls and Meetings** section and will be used based on the value chosen for this parameter. Acceptable values are: 
 
-VoIPAlways: Allows audio over cellular (3G/4G) or a WiFi connection.
+**VoIPAlways:** WiFi will be used when available, otherwise a call back will be performed.
 
-VoIPOverWiFi: Allows audio over a WiFi connection only.
+**VoIPOverWiFi:** If WiFi is not available, a call back to the pre-defined phone number will be performed.
 
-Cellular: Allows audio over cellular (3G/4G) connection only.
+**Cellular:** Always perform a call back to the pre-defined phone number.
 
 ```yaml
 Type: Object