Here is a cmdlet in powershell that can pickup all info of mobile device that connecting to exchange server 2013.
Get-MobileDeviceStatistics -Mailbox xxxx | select DevicePhoneNumber
I noticed that somehow, this cmdlet only pickup last 4 digits of Android Phone number, non of iPhone number got picked up...
iOS 7 and up
Android 4.4 and up
Some one knows why or is there anyway to do this?