cations The Apple website provides details of how this service works on iPhone (see https : / / support apple.com/en-us/HT213426). Figure 16.4 shows the screenshots of the SOS (which is derived from the phrase Save Our Ship) steps. Settings Emergency SOS Demo This is not a real emergency Danny Rico & Emergency Services Information sent to dispatcher Type of Emergency Sickness or Injury Information Sent Location, Medical ID, and emergency description Who needs help? How are you breathing? Normally What best describes the emergency? Traumatic Injury CONNECTED Keep Pointing at Satellite to Send and Receive Location from 11/8/22 Emergency Services You have reached the Emergency Relay Center. I am reviewing the information you provided. Describe Preparing demo of the location of the emergency. emergency message.. About this chat This is being sent to you since Danny Rico listed you as an emergency contact. You cannot reply to this chat. Figure 16.4 - Satellite-based emergency service on iPhone Let us see, in Figure 16.5, the high-level architecture of the satellite-based SOS system. The Apple iPhone 14 model includes the hardware component and required antenna to communicate with 48 Low Earth Orbit (LEO) satellites from a company called Globalstar. The first 2 years of this service are free to consumers. Figure 16.5 shows the high-level approach. Introduction to satellite communications Satellite iPhone Ground station Relay center Emergency services Figure 16.5 - How satellite-based Emergency SOS works In Figure 16.6, we look at the next level of architectural details for this solution. We can see that the Gateway (GW) to the Globalstar LEO satellite uses C-band, while the satellite-to-device connection uses S-band and L-band for communication. C-Band (6875-7055 MHz) C-Band (5091-5250 MHz) L-Band (1610-1618.725) MHz) S-Band (2483.5-2500 MHz) Mobile Earth Devices Gateways Internet Figure 16.6 - Globalstar network architecture for SOS T-Mobile and SpaceX are working toward a similar service e(https://www.t-mobile.com ne