I need knowing the differences between a PC hardware and a android device (smartphone), because i have some issues understanding somethings about some subjects.

Generally when I have a computer if I have any restriction , like password in bios or special software into EPROM I need to modify it manually for accessing the PC or make it "totally" under my power.

I want to understand how operators blocks the bootloader of a phone, or "lock" it (not other operators SIMCARDS can work into the device), is this in hardware? Or inside EPROM software? Same way with rooting. If I install a Linux OS in any PC I will be root directly, what happens with the hardware inside smartphones?

Can I have a PC with a network card "locked"? The only way of this is having the eprom of the periphery network card specially programmed.

I think that I need a lot of more knowledge about this subject and I am searching for some books or MOOC that can explain me these specs for deeply understanding the hardware/software interface of an android device phone or any phone in general. I think, for perfectly understand the hardware configuration of any phone device (IOS,Android,windows phone or the nokia stone).

Examples of my problem:

1.I can have a custom rom in a device, but still is locked, sometimes by software we aim to unlock it, maybe it is inside the software of the GPS antenna?

2. Sony xperia j st26i "bootloader locked", thats mean, I need to manually flash the eprom for installing a bootloader and custom roms?

Thanks for your help.

I need knowing the differences between a PC hardware and a android device (smartphone), because i have some issues understanding somethings about some subjects.

Generally when I have a computer if I have any restriction , like password in bios or special software into EPROM I need to modify it manually for accessing the PC or make it "totally" under my power.

I want to understand how operators blocks the bootloader of a phone, or "lock" it (not other operators SIMCARDS can work into the device), is this in hardware? Or inside EPROM software? Same way with rooting. If I install a Linux OS in any PC I will be root directly, what happens with the hardware inside smartphones?

Can I have a PC with a network card "locked"? The only way of this is having the eprom of the periphery network card specially programmed.

I think that I need a lot of more knowledge about this subject and I am searching for some books or MOOC that can explain me these specs for deeply understanding the hardware/software interface of an android device phone or any phone in general. I think, for perfectly understand the hardware configuration of any phone device (IOS,Android,windows phone or the nokia stone).

Examples of my problem:

1. I can have a custom rom in a device, but still is locked, sometimes by software we aim to unlock it, maybe it is inside the software of the GPS antenna?

2. Sony xperia j st26i "bootloader locked", thats mean, I need to manually flash the eprom for installing a bootloader and custom roms?

3. Android OS Firmware vs Phone firmware?

Thanks for your help.