iPhones have a lot of settings that facilitate the lives of users, including 4 hidden features designed by Apple in disaster situations, and we will show these features that may make a real difference between life and death.

Medical ID
The medical ID or what is known as "Medical ID" is not new to iPhone users, but most ignore it, as the medical ID contains information that may be useful in cases, such as allergies, medical conditions, and contacts in critical cases, and this information can be displayed on the iPhone so that it is available to paramedics in the event of an accident.
To activate this feature, go to the Health app, click on the profile picture, then tap Medical ID, just fill in the information and you are ready, and the medical ID must be updated constantly, including emergency contacts.

Satellite Emergency Service
This feature was introduced in the "iPhone 14" and later, which allows connecting to emergency services "SOS" via satellite when you are out of the network, as this feature does not need a cellular signal or Wi-Fi network to work.
To work for this feature, all you need to do is stand in a wide place where the sky appears without obstacles or walls, and it can take a few seconds to a minute to establish the connection. To activate the feature, go to Settings and then Emergency "SOS", and here you can try the trial version of the feature, it teaches you to establish a satellite connection so that you are ready if you need it one day.

Check
Check-In was added to iPhones in the 2023 iOS 17 update, designed to automatically notify a friend or family member when they get somewhere. You can also choose which details you want to share with this feature, for example a contact can view your location, battery percentage, and phone signal.
According to Apple, you and your friend will need to activate the reassurance feature of activating "iMessage" and log in using private Apple accounts and enable two-step authentication, and your destination and estimated arrival time will be shared with your friend when you start a destination session. This feature will monitor your flight and warn your contact if your iPhone stops progressing or does not reach the destination, and if you reach the destination, an alert will appear for your friend telling them that you have arrived at your destination safely.

Collision Detection Management
Apple has given the collision detection management feature to iPhone 14 and later phones and for modern Apple watches as well, and it is designed to detect severe car collisions, such as frontal collisions, side collisions, rear collisions and rollover accidents. This feature works by default, as it does not require entering the settings and activating the feature, but it is worth checking that you have never turned it off.
The feature works when a serious car accident is detected, as the iPhone will sound an alarm and display an alert, and the alert will read aloud if you cannot see the screen. Here you can choose between calling the emergency services or refusing it, and if you do not respond for some reason, the iPhone will automatically call the emergency services after 20 seconds. If you set up emergency contacts using medical ID, your iPhone will send a text message to your friends or family with your location and tell them what happened.

ALJazeera