Yes, you can absolutely use your phone on Wi-Fi internationally without incurring expensive roaming charges, provided you have the correct settings enabled. Once you connect to a local Wi-Fi network (at a hotel, cafe, or airport), you can use internet-based apps like WhatsApp, iMessage, Messenger, and FaceTime for communication for free. To ensure you don't accidentally trigger a "Daily Roaming Pass" from your carrier, you should either keep your phone in Airplane Mode with Wi-Fi toggled back on, or turn off "Cellular Data" and "Data Roaming" in your settings. In 2026, most modern smartphones also support Wi-Fi Calling, which allows you to make and receive traditional phone calls and texts using a Wi-Fi connection as if you were back in your home country; however, you must check if your specific carrier supports this feature abroad. Using Wi-Fi is the single most effective way to stay connected while traveling globally, allowing you to access maps, translate signs, and post to social media without the "bill shock" that often comes with traditional international data usage.