When you define a Custom field that has the type “phonenumber”, you can now call the number directly when selecting it from the view screen of the data item.
In the same way when you define an “email” type of custom field, you can email the contact directly from the view screen.
N.B.: Requires Upvise version 4.1.4 for Android
Custom Fields can be defined in the Contacts, Projects, Sales app, etc..: click on the More button in the tool bar of the web app and select the Custom Fields menu.