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The Skype app will have you making calls around the globe with no fuss, and without picking up the bill for high roaming charge.
It's a free app that uses a Wi-Fi connection to make calls to anyone with a Skype username that you are connected with. In a call, you can swipe from the video call to access instant messaging, or view their profile.
If you want to call or text a number outside of Skype, then you can join a subscription service to make cheaper international calls.
Be careful of using Skype on any pay-as-you-go Internet connection, as it does (naturally) hog a vast amount of bandwidth.