Add Phone Numbers to existing AD Contacts

vision311 Hello, Dani. 

You can adapt this snippet to your requirements. 

$ADContacts   = Get-MailContact -ResultSize unlimited -OrganizationalUnit 'Domain.local/Unit1/Unit2/Unit3'
$PhoneNumbers = Import-Csv "C:\Users\emoreno\Desktop\Gal_Export.csv" #Headers: MailAdresses | Telephone | Mobilenumber

Foreach($ToSet in $PhoneNumbers)
 {
  $ContactMatch? = $null
  $ContactMatch? = $ADContacts | Where-Object{$ToSet.MailAdresses -like "*$($_.PrimarySmtpAddress)*" } 
  
  If($ContactMatch?)
   {
    Write-Host "Match found for $($($ContactMatch?.PrimarySmtpAddress).Address)" -ForegroundColor Cyan
    Set-Contact -Identity $($ContactMatch?.Identity) -Phone $ToSet.Telephone
    Set-Contact -Identity $($ContactMatch?.Identity) -OtherTelephone $ToSet.Mobilenumber
   }
  Else
   {
    Write-Host "No Mail Address Match for $($ToSet.MailAddresses)" -ForegroundColor Yellow
   }
 }

Regards

Erick Moreno