Will a Factory Reset lock my phone (Samsung Galaxy S2) if it is unlocked, but factory locked? I know that formatting the SD card will not lock my phone again. 

But if I Factory Reset my phone, will it re-lock the phone or not?
A factory reset will not change the status of the phone with regards to "device lock" (Can I connect to other networks?) or to "bootloader lock" (Can I use custom ROMs?).