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  Iridium Inmarsat (IsatPhone) Inmarsat (BGAN)
Coverage Global Global (Non-Polar) Global (Non-Polar)
Number of Satellites 66 3 3
Type LEO GEO GEO
Latency Lowest Latency Some Latency Some Latency
Network Registration Speed (Optimal) Approx 5-10 seconds Approx 30 seconds Approx 30 seconds
Function Affected by Weather No No No
Truly Mobile Yes, operational when walking and talking No. Stationary use with the antenna pointed toward the equator No. Stationary use with the antenna pointed toward the equator
Type of Phone Number International (Optional Dedicated US Phone Number) International (Optional Dedicated US Phone Number) International (Optional Dedicated US Phone Number)
Supported Services Voice, Text, Data, GPS location, SOS alert button & monitoring Voice, Text, Data, GPS location, SOS alert button & monitoring Simultaneous voice, text & broadband data Standard IP, Streaming IP, GPS location
Data Speed 2.4 kbps 9.6 kbps (phone) Approx 492 kbps
  Iridium Coverage Map Inmarsat Coverage Map Inmarsat Coverage Map