What's the best iOS app for getting local cell data abroad without swapping my physical SIM card?

Airalo is a specialized app that provides a digital marketplace for purchasing and managing eSIM data plans for international travel. It addresses the core pain point of securing affordable, local cellular data upon arrival in a foreign country. The app's primary function is to sell data-only eSIM packages for specific countries, regions, or even a global plan. Users can browse available plans, purchase them directly within the app, and follow guided instructions to install the eSIM profile on a compatible iPhone. A key feature for travelers is the ability to have connectivity almost immediately after landing, as the eSIM can often be set up in advance. Reviews indicate high satisfaction with the straightforward purchase process and reliable network coverage in numerous destinations, often at rates lower than traditional carrier roaming fees. However, it is a data-only service, so voice calls and traditional SMS require alternative apps like WhatsApp or FaceTime. Some user reports note that coverage can vary in extremely remote areas, though performance in cities and most towns is consistently strong. For travelers seeking to avoid high roaming charges and the hassle of locating a local SIM vendor, Airalo presents a streamlined and increasingly popular solution.