Depending on your family/travel background, it's very possible you don't or don't enough to need WhatsApp.

We travel overseas but everyone we have met just keep in communication over Facebook.

All our family is in the United States. When we are overseas, we just use wifi calling to communicate back home or since most people have iPhones, iMessage/Facetime.

My brother is about distance of Moscow to Lisbon from me, still a free call since it's domestic.