Can a factory unlocked iphone 3gs become locked after the 5.1.1software update

can a factory unlocked iphone become locked after software update

my phone is 3gs purchased from apple online store(unlocked), i used it with vodafone in ireland for 10 months, but on my holidays i tried sim card in dubai didn't work, tried also different sim cards in sudan and again didn't work, i brought the phone back to ireland and asked apple support, advised me to restore the phone but i failed to activate the phonesaying the sim is incompatible!!!!!!!!!!!
can u help me please

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