The activity tab on the iPhone app highlights new contacts, email opens and clicks, and recent website activity to provide insight into your database. 

How to Find Activity 

Access lead activity by clicking the activity icon

Activity Filtering 

New Leads

The new leads tab displays your newest leads.

Emails

The emails tab shows contacts who have opened or clicked an email.

Website

The website tab displays the most recent activity on your website, including viewed and saved properties.