The iPhone models currently sold on apple.com work with nano-SIM cards from compatible carriers*. And they work on many 4G LTE networks around the world. Contact service providers for details.
* 64GB iPhone XR and 64GB iPhone XS 64GB pricing is after trade-in of 32GB iPhone 7 Plus. This offer is only available until April 30, 2019. Trade-in values available for a limited time only and require purchase of a new iPhone, subject to availability and limits. Trade-in values vary based on the condition, year, and configuration of your trade-in device. This offer is only available at Apple Retail Stores and is not available in the Apple Online Store. The trade-in value offered by Apple Retail Stores and the Apple Online Store may vary. You must be at least 18 years old. In-store trade-in requires presentation of a valid, government-issued photo ID (local law may require saving this information). Additional terms from Apple or Apple’s trade-in partners may apply.