i was just asking generally, if from technical view it is possible. i am not familiar with mobile devices how they are working with OS. on computer you can replace windows with linux, bu i was not sure if you can do that also on mobile.
thank you
It's just a hardware platform like a PC... BUT it's not documented. That's the problem.
On a PC, it's well known how to develop on it, and the PC has a 'bios' that helps to interface with the hardware (although these days, even the hardware is so well known about, folks don't need the bios.
On a mobile, the components are much more obscure since every phone has it's own design. Usually the only folks able to develop at the lowest layers happen to be insiders of some sort who know the hardware platform. The higher layers are easier to develop for (not easier to code, just better documented) so more folks can contribute.
Most modern phones tend to have a 'split' architecture... a Phone system handling the core services (like radio, power management, DSP etc) and then the Application system, usually an OS of some sort hosting all the apps and user services. The interface between the two is often pretty proprietary. So for instance the Symbian OS could be built on top of a Nokia, Sony Ericsson or other phone system. This is also true of Linux/Android, WinMo etc.
Also, some devices have secure bootloaders that can't be (easily) accessed, and these can perform some sophisticated 'checks' on the validity of the rest of the code. These can be very troublesome devices to hack. Fortunately they are few and far between.
Technically, it's illegal to be using a phone with hacked code... it's simply not approved to be used within the network. In theory, malfunctioning radio code could interfere with other users and cause the base station some grief. It would be VERY difficult to break the network, but could affect the performance and power output of the base station (cos the phone constantly tells the base station about the quality and timing of radio the phone is receiving, and the base station and phone negotiate to optimise the performance)