You can now adjust the From Caller ID while creating your alert, as shown in the picture below.
The From Caller Id number will default to what has been predefined in Settings > Messaging Settings> Messaging Defaults > From Caller ID:
To change your From Caller ID when creating a new alert, click the down arrow in the box and select which number you would like to use. This is the number that will appear on the recipients phone.
Note: If you would like to have multiple caller ID's added to your account, please contact Customer Support as they will need to update your settings at 888-786-9051 or k12support@alertsolutions.com.