$Users = Get-ADUser -Filter * -Properties MobilePhone,Pager
foreach ($user in $Users){
Set-ADUser -pager $User.mobilephone -whatif -verbose
}
Get-ADUser -Filter * -Properties MobilePhone,Pager | ForEach `
$user = $_
$user | Set-ADUser -Add@{pager = "$($user.mobile)"} -whatif -verbose
}