[Q] Litle help :) topic

Hi i have m2 xperia i was wondering if i unlock bootloader will that unlock phone for all cariers also if not if i change to cm11 rom would that help and if that cant unlock it how can i unlock it. Carier doesnt whana give me code untill 24 months are pased and i dont need phone whana give it to my mom but she is mt:s and i am vip network thx for help ^^