Cases - Send Copy of an Activity, Add Individual Phone and Email
Fatith, As per your requirement this is not straight forward and needs some custom coding or need good knowledge about using smarty api since the created id is stored as source contact id for an activity and data of source contact id is directly not available in smarty or as a token.

Here is possible solution for this


Create token and token values using CiviCRM hooks, then add tokens in message template
Like @demerit said use smarty to get contact details of the person who created the activity. Below snippet should work in your case. You need to add the below code in desired place in message template.


snippet:

{if $contact.activity_id}
  {crmAPI var='activityResult' entity='Activity' action='getsingle' return="source_contact_id" id=$contact.activity_id}
  {crmAPI var='contactResult' entity='Contact' action='getsingle' return="phone,email" id=$activityResult.source_contact_id}
  &lt;tr&gt;
    &lt;td&gt;Phone Number&lt;/td&gt;
    &lt;td&gt;{$contactResult.phone}&lt;/td&gt;
  &lt;/tr&gt;
  &lt;tr&gt;
    &lt;td&gt;Email&lt;/td&gt;
    &lt;td&gt;{$contactResult.email}&lt;/td&gt;
  &lt;/tr&gt;
{/if}


HTH

Pradeep