My iphones model says MB489AB and the bootloader is 5.12.01, is my

[SouptikPal]

iphone factory unlocked? the phone does not have cydia and when i got it i just popped in my tmobile sim card and it worked.

 

[Andrew1]

if it is running 3.1.3 firmware it is probably factory unlocked, there is no unlock for 3.1.3