Selecting a satellite phone depends heavily on the satellite network provider. Iridium offers 100% global coverage, including the poles, making it ideal for maritime and polar expeditions. Inmarsat provides near-global coverage (excluding poles) via geostationary satellites, which is excellent for stable data connections. Thuraya covers Europe, Africa, and Asia, offering dual-mode (GSM/Satellite) phones that are cost-effective for regional travelers. Always verify that the provider's footprint aligns with your specific geographic operational area.