Maximum security and protection for your iPhone

1. No. While Find My will still work with the phone off and/or no data connection, Bluetooth could be used for another phone to transmit the location of your device, but not without Bluethooth turned on. Determining location uses several methods with GPS being the most accurate. Without GPS, then the phone will attempt to use WiFi and cellular triangulation to determine the location. Of course, the device would need to be on to use those antennas. About privacy and Location Services in iOS, iPadOS, and watchOS - Apple Support
2. Your phone needs to be turned on with a data connection from either cellular or wifi.
3. No. There is no app that is going to protect your phone better than what Apple provides. More information about iPhone security is here: Use the built-in privacy and security protections of iPhone - Apple Support
4. Only what you have set to use iCloud, the iCloud backup includes data from the following link. You are not able to remote into your device and transfer information.

What does iCloud back up? - Apple Support

Baidimiao wrote:

1. A few questions:

is My Find available if the phone is not turned on, Bluetooth is off, and is underground, where there is no GPS or what technology, conditions must be fulfilled to work properly?

2. How does the data deletion work? What must be turned on, what conditions must be met to work properly?

3. Can you recommend any third party app for maximum security and protection?

4. If the phone is lost/stolen, I get a new iPhone, and would like to recover my account, what will be actually recovered? Settings, Data, Files, Photos, Apps etc., is there a list?

Thank you very much for your assistance!

1. If the phone is not powered on or connected to a network, Find My won't track it
2. The data deletion will only work, if and when the phone is powered on and connected to a network
3. Third party security tools for iPhone are pointless. iOS is a walled garden and virtually impossible to hack.
4. Make sure you are backing up every day and you have iCloud sync for all items turned on. If you get a new phone, you'll be able to restore from your most recent backup, which will contain all the data (you may have to log into some accounts again) you had on the phone at the time of the backup

If there is no connection at alll, find my will not be avaliable to see the current location. Instead of that, you will see the last known position

For data deletion, find my needs to be turned on and the iPhone needs to have power

No. no third party apps are nessecary, iOS has a very good security and any third party app will interfere with this security

If the phone is lost and you have a good backup. you can recover anything, your new iPhone will be just like the old one. I recommend making 2 backups, one locally via a pc or Mac and one via iCloud. That way, if one of the backups get corrupted or your pc breaks down etcetera you have a second one