Use internet-based calling apps with free app-to-app calls
Call over Wi-Fi using VoIP services
Use free trial credits from calling apps
Take advantage of promotional free minutes
Use messaging apps that support voice and video calls
Use carrier apps that include free international calling plans
Call during free calling periods offered by some providers
Use public Wi-Fi with a calling app
Use free conference call services that allow international access
Ask the person overseas to call you back using their free local plan