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Segmentation maps a logical address (a 16-bit selector plus a 32-bit offset) to a 32-bit linear address, enforcing privilege and limit checks along the way. Paging then translates that linear address to a physical address, adding a second layer of User/Supervisor and Read/Write protection. The two layers are independent: segmentation is always active in protected mode, while paging is optional (controlled by CR0.PG).
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Apple’s satellite features are designed for situations where cellular and Wi-Fi coverage are unavailable. In supported regions, compatible iPhone 14 or later models can connect directly to a satellite to send messages, access Emergency SOS and share location data. Location sharing via satellite is particularly useful when traveling in remote areas, hiking or driving through regions with limited network coverage. This guide explains what is required to use location sharing via satellite on an iPhone, how to prepare the feature in advance and how to send your location when no signal is available.