Question quastion about my unlock droid razr hd

hi all dear ultra user .

i buy one droid razr hd from ebay .
its gsm unlock ( i dont know its factory unlock or unlock with code )

and i use it very good .

if i flash new rom or update it . is this possible my phone do lock carrier after update or flash new rom ?
but i afried to update my phone and Lose it unlock .


please answer if you know ):
sorry for my bad english
motorola for ever
my moto phone history : v3-- v3x-- z8-- z10-- e6-- l6i -- zn5 -- wx180&181-- xt502-- xt720-- defy -- ex115--- backflip-- v8 gold ---atrix --razr xt912- defy plus --- cliq xt --- sony xperia s --- atrix hd ... razr hd .... razr i .... droid ultra limited edition . ...

what is next !? ((:

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