Standard Radio with two speakers

[allomani]

Hi,

I bought new 2014 Nissan Altima S that came with standard AM/FM radio with two front speakers only (only for GCC specs) i think it's Part# is 281853TA0A

So i want to know if i want to add 2 more speakers with out adding Amp or modifying on car wires, is the car has wiring in rear doors or rear deck?

Another thing, the steering wheel does not include Volume +/- and Phone buttons,

So i want to know also if I installed SV or SL steering switches (Part#25550 3TA3A)
Phone Bluetooth connectivity and Radio Volume +/- will it work or not?

I'm wondering also if there a microphone on roof or not!

Thanks in advance.