You are able to create tel: and mailto: buttons in pagebuilder..
Once a customer clicks a tel:-button, the device will start calling the phone number.
Clicking a mailto:-button, will open the default mail-app on the device with the provided e-mailaddress as receiver/destination.
To use this, add a button and choose for "Link". After that, add tel: or mailto: followed by the destination.
We suggest you adding a country code to phone numbers, if your campaign goes international.