Everyone knows that a smartphone has two operating systems. One that represents the graphical use and the other that handles radio communication. How would you know if either, esp the latter has been hacked?
All of my connections, even under everyday circumstances have been incredibly weird and shaky too over the past few days. And I get the feeling someone may be listening in or watching. How can you test this?
Ok, I posted funny answer above. So I will explain you.
There are not 2 operating systems on your phone. There is one system.
1. Bootloader is not system, it's program to boot system found on partition
2. If you clear system like iOS or Android, bootloader remains because mostly it's locked
3. Sometimes you can clear bootloader when you unlock it. If you do it, you will brick your phone. There is no mysterious OS working on phone
4. Restoration programs can restore bootloader if producent made such software for PC system. It will detect phone via USB protocols like external storage and place bootloader files in correct destination
5. If you are worried, reset to factory settings. It will clear 99% cases of "listening"
Probably your phone is just old loaded with trash and it's slower.
OS can be hacked, for example with Pegasus (Israeli military software), but once you get soft removed, your phone is unhacked.
-------------------------------
There are hardware things hardcoded by phone producents on chips, they cannot be hacked
Thats why goverment can check your positition even your phone is disabled, because 2G antenna.
Don't worry, these things cannot be saved by software you installed on your device.