For international calls, you can use WhatsApp for international voice and video calls. It lets you connect with people worldwide, as long as both you and the person you're calling have the app installed and are online. The calls work using Voice over Internet Protocol (VoIP), meaning they travel over the internet instead of traditional phone lines.
Does WhatsApp apply charges for international calling?

Good news – WhatsApp doesn't charge you anything for making international calls. Ever since they dropped their subscription fee back in 2016, all messaging and calling features, whether local or international, come without any direct cost from WhatsApp itself. You won't find any per-minute rates or hidden app fees for calling contacts overseas.
What determines the cost of WhatsApp international calls?
Although WhatsApp won't bill you for the call itself, whether it costs you anything really boils down to your internet connection. Because these calls use data, any potential costs aren't from WhatsApp; they come from your internet provider or mobile carrier based on how much data you use. For instance, if you're making calls over a Wi-Fi network (like the one at home, work, or a coffee shop), you generally won't face extra charges beyond what you already pay for internet access. The call's data usage is just part of your normal Wi-Fi plan, making the call essentially free from extra fees.
Using mobile data for calls

However, if you use your phone's mobile data (like 4G or 5G) for WhatsApp calls, that data usage eats into your monthly allowance. Go over your limit, or if you're on a plan where you pay for data as you go, your carrier will bill you for it. This is how a "free" WhatsApp call can end up costing you money, with the exact amount depending entirely on your mobile provider's data pricing.
How does international roaming impact call expenses?
Using WhatsApp on mobile data while you're traveling abroad (roaming) can get expensive, fast. Carriers are notorious for charging steep prices for international data roaming. Just a quick WhatsApp call might use enough data to trigger surprisingly high charges from your mobile provider on your next bill. Your best bet is sticking to Wi-Fi whenever you can overseas to dodge these roaming fees. Before you travel, look into your carrier's international roaming plans and data costs.
So, are WhatsApp international calls truly free?
So, the bottom line? Calling internationally using WhatsApp itself costs nothing. But the calls are only genuinely "free" when you're connected to Wi-Fi that you're already paying for or can use freely. Switch to mobile data, particularly when roaming internationally, and you'll face data charges from your phone company. So even though WhatsApp isn't sending you a bill, how you connect to the internet really dictates what you might end up paying. Keep an eye on your data usage and whether you're on Wi-Fi or mobile data to avoid unexpected costs.