Although the AOW Global Data SIM is a data-only service, you can use a VoIP (voice over IP) app like Google Hangouts to make calls and send messages to your Hangouts contacts.
Hangouts is a free download on the App Store and comes pre-installed on most Android devices, so it’s very simple to use. It links to your Google account, so you can use these credentials to login. Hangouts will automatically sync your phone contacts so that you’re connected to everyone you know with a current Hangouts account.
To make calls or send messages, simply tap any of your Hangouts contacts and select Send message, Video call, or Voice call.