iPhone Factory Unlock vs Software Unlock Part Number

To check your iPhone whether Factory Unlock (FU) or Software Unlocked (SU), on your iPhone open up Settings -> General -> About -> Find Model and match with table below :

iPhone	Country	Carrier	Part Number		Specification
			Factory Unlocked (FU)	Software Unlocked (SU)
4S			MD239ZA		16Gb White
4	Australia		MC603X/A		12Gb Black
			MC605X/A		32Gb Black
	Canada		MC603C/A		16Gb Black
			MC605C/A		32Gb Black
	France		MC603FB/A		16Gb Black
			MC605FB/A		32Gb Black
	Hong Kong		MC603ZP/A		16Gb Black
			MC605ZP/A		32Gb Black
	Indonesia		MC605PA		16Gb Black
			MC603PA		32Gb Black
			MC605ID		32Gb Black
			MC606PA		32Gb White
			MC604PA		32Gb White
	Italy		MC603IP/A		16Gb Black
			MC605IP/A		32Gb Black
	New Zealand		MC603X/A		16Gb Black
			MC605X/A		32Gb Black
	Singapore		MC603ZA/A		16Gb Black
			MC605ZA/A		32GB Black
	Sweden		MC603KS/A		16Gb Black
			MC605KS/A		32GB Black
	United Kingdom (UK)		MC603B/A		16Gb Black
			MC605B/A		32GB Black
	Germany	T-Mobile		MC603DN/A	16Gb Black
				MC605DN/A	32GB Black
	Japan	Softbank		MC603J/A	16Gb Black
				MC605J/A	32GB Black
	Spain	Movistar, Orange, Vodafone		MC603Y/A	16Gb Black
				MC605Y/A	32GB Black
	United States America (USA)	AT&T		MC608LL/A	16Gb Black
				MC610LL/A	32GB Black
		Apple		MC318LL/A	16Gb Black
				MC319LL/A	32GB Black
All Gen	Belgium	Mobistar	MB489NF/A
			MB496NF/A
			MB500NF/A
			MC131NF/A
			MC132NF/A
			MC133NF/A
			MC134NF/A
	Czech Republic	O2, Vodafone	MB489CZ/A
			MB496CZ/A
			MB500CZ/A
			MC131CZ/A
			MC132CZ/A
			MC133CZ/A
			MC134CZ/A
		T-Mobile	MB490CZ/A
			MB497CZ/A
			MB501CZ/A
			MC139CZ/A
			MC140CZ/A
			MC141CZ/A
			MC142CZ/A
	Greece	Vodafone	MB489GR/A
			MB496GR/A
			MB500GR/A
			MC131GR/A
			MC132GR/A
			MC133GR/A
			MC134GR/A
	Ireland	O2	MB489B/A
			MB496B/A
			MB500B/A
			MC131B/A
			MC132B/A
			MC133B/A
			MC134B/A
	Italy	TIM, Vodafone	MB489T/A
			MB496T/A
			MB500T/A
			MC131T/A
			MC132T/A
			MC133T/A
			MC134T/A
	Luxembourg	Vox Mobile	MB489NF/A
			MB496NF/A
			MB500NF/A
			MC131NF/A
			MC132NF/A
			MC133NF/A
			MC134NF/A
		LUXGSM, Jazz	MB489FB/A
			MB496FB/A
			MB500FB/A
			MC131FB/A
			MC132FB/A
			MC133FB/A
			MC134FB/A
	Russia	Megafon, MTS, Beeline	MB489RS/A
			MB496RS/A
			MB500RS/A
			MC131RS/A
			MC132RS/A
			MC133RS/A
			MC134RS/A