The "satellite" feature on iPhone, available on iPhone 14 and later models, allows users to connect their device directly to a satellite when there is no cellular or Wi-Fi coverage. This connection enables texting emergency services, requesting roadside assistance, messaging friends and family, and sharing location while off the grid

How it works:

• The iPhone communicates with satellites hundreds of miles above Earth, which move rapidly and have low bandwidth.
• Sending a message via satellite takes longer than cellular; in ideal conditions, about 30 seconds, and over a minute under light or medium foliage.
• Heavy foliage or obstructions may prevent satellite connection.
• Connection times depend on surroundings, message length, and satellite network status.
• Compatible software (latest iOS version) is required to use the feature

Additional details:

• Apple includes two years of free satellite service with the activation of an iPhone 14 or later.
• The satellite network is provided by Globalstar, Inc. and affiliates or third-party providers.
• This feature is not available on iPhones purchased in certain countries (e.g., China, Russia, Belarus)

• With iOS 18, Apple expanded satellite messaging beyond emergencies, allowing users to send and receive texts, emojis, and tapbacks via satellite directly from the Messages app, maintaining end-to-end encryption

In summary, the satellite feature on iPhone is a safety and connectivity tool that uses satellite communication to keep users connected for critical messaging and location sharing when traditional networks are unavailable.