This could be a great way to eliminate some spammers out there, or get more users to sign up.
Step One:
Create two phone number link Action List items.
Step Two:
On the First Action List visibility, “Hide this row if”:
Step Three:
- First rule group (phone is empty).
- Second rule group (User is logged out).
On the Second Action List visibility, “Show this row if”:
- Single rule (User is logged out).
Note:
On this second Action List, instead of linking to the phone number, you would link to the Auth page. Dynamic tag: Site -> Login URL aka @site(login_url). Also, ensure to uncheck the "Open in new window" for a smooth redirect back to the same page after logging in.