I recently acquired a second Samsung Softbank 707SCII and this one is software unlocked.

I read somewhere that doing a full reset will lock the phone again? Is this correct? I also read somewhere if I remove the battery for over 36 hours the phone resets itself and becomes locked again.

My question is this: I plan to store this phone ether as a a backup or as a gift to a family member months from now. So will storing the phone in its box for months at a time cause it to reset and lock again?