how can i change my OS from Symbian to android on my Nokia Asha 201?

-impossible. Android is a heavy, clunky os that requires its devices to have fast processors and different hardware just so it can run smoothly. Nokia perfected symbian to be a lightweight os that runs smooth without those requirements. No symbian device has the hardware to run android.

Besides all that, ur phone isnt even a symbian smartphone. Its an s40 java feature phone. Ur phone doesnt even have the hardware to run symbian, let alone android.

Go to retailer. Ask him about exchange. Give him some more money and exchange your symbion phone with android. Thats the easiest way to Android.

Unfortunately this is not possible. You need to change your phone.

not possible, sorry..