You can use Mobile Phone or Pager for features such as:
Notify Me (if enabled).
Reach Me forwarding number.
Other mobile phone when using Play on Phone, Voice Reply, Voice Forward, and Call Sender in your e-mail client.
The following options are available for Mobile Phone or Pager:
Mobile phone in directory, which uses your mobile phone number stored in the internal directory.
Other mobile phone or pager, where you can specify an alternate mobile phone or pager number.
