That's a score! I use wifi calling exclusively but last year a couple of calls to Leslie about the car also incurred zero charges. I also have the Verizon Travel Pass for emergencies but have only used it once in France....excellent backup but I would never use $10 worth of calls in a day but if there is no wifi it is a life saver....if you don't have wifi calling then the monthly Travel Pass plan works fine....

Options:

...use an unlocked phone/sim card and pre-pay for minutes....cost varies
...Travel Pass (or similar) on present phone...$10 per 24 hours when used or monthly charge
...WiFI calling on present phone..no charge for any USA calls made or received..wifi needed....MAY BE a charge for non-USA calls
...WhatsApp on present phone...no charge ..wifi needed and contacts called also need the app installed...REALLY popular outside the USA