Let’s continue with your phone. Any closed software is a problem. Ditch iOS and Android. In some extreme cases you might need one for your bank apps, or some apps might be extremely essential for you. I might understand that, so if this is the case, buy a cheap one and use that phone without SIM just for these needs. I am sure you can do whatever you want from the browser or laptop, but this is an extreme measure. Let me tell you what your mobile device has about you, you need to see the truth before making and effort to solve it:

• Records of what you say anytime. (Hello Siri!)
• Records of your location, constantly, even when you turn them off. And if you use Wi-Fi, your exact movement. https://www.youtube.com/watch?v=HgDdaMy8KNE
• Always records other devices around you. So they know who is your friend and who you are working with.
• Your health data. Your steps, screen time.
• All your network locations – Wi-Fi spots.
• All your pictures, videos, notes.
• Records of all your accounts, including e-mail, social media, financial accounts. And all of this information is stored indefinitely, mostly unencrypted. HOWEVER, most of you do not only use mobile phone, but also use smart watch, smart speaker, smart transportation, smart ... bulshit. Now THINK what they know about you. You might guess how they use this information about you. Let me give you some examples and this is only the tip of the iceberg.
• Law enforcement agencies can get your network activities.
• They can track how you write. How many times you mistype. How you use your mouse and how it reflects your psychologically unique behavior.
• Marketing.
• They can change your feelings and mood. - They can make you suffer! Feeling paranoid already? Good.

What about hardware? What are you going to use?

• OK, first, we will have Pixel phone. I have tried 7 and 6a, both are same, but I am against to pay premium for a phone. It is just a fucking phone, not a car. So, buy Pixel 6a.
• Install GrapheneOS. It has all closed OS code running in a HAL sandbox and the system is extremely hardened and backed by a great hardware. Use this without SIM and you are secure.
• Unlike other android phones, Pixel has verified boot which is one of the most important hardware security features.
• Disable Wi-Fi and Bluetooth. Geo-location is not only done by triangulation of cellular antennas and GPS, it is also done by Wi-Fi and Bluetooth devices around you. Operating systems makers like Apple and Google already have a list of most Wi-Fi access points. If your phone is on, it will passively scan access points around you and geo-locate your location all the time.

This feature can provide them the exact location of a person even when the Wi-Fi is off. And this can be accessed by them or third parties for tracking.

Also, a side note, this is not only what Wi-Fi can do. With recently developed tech, someone can track your exact movement just based on radio interference. Thus, at this point best bet is to disable Wi-Fi all together.

Even worse, some devices can be tacked even when they are offline. Therefore, you might see in some movies, that person always remove the battery. These devices are iPhones and iPads, Samsung Phones, MacBooks and most probably many more. These devices constantly broadcast their identity to nearby devices using Bluetooth Low-Energy. So, it might not be connected to any internet, but your location is still being tracked.