make a phone-number-hyperlink option so people who read the email on their phone can click the phone number in the email to dial
When creating a Form Letter/HTML Form Letter to be used as email, make the phone number a link to dial, for users that open the email on their phone
Jim Schoonover commented
Great Idea! Most of our clients use their phone to see our emails.
This is a great idea
Stephanie Lesser commented
and of course, it should work in a form-letter SMS Text message too.