What is the best data SIM card for international travel?

The best data SIM for professional travel is one that features "unsteered multi-network roaming." Standard consumer travel SIMs stubbornly lock you to a single preferred partner network to save the provider money. Our unsteered SIMs have no network preference. They constantly scan your location and automatically connect you to whichever local cell tower offers the fastest 4G/5G speeds, regardless of the brand.