After a long-long Sim card re-write process you will need the last thing to do. You need check and find IMSI that is appropriate for your location and related service provider. It needed to complete unlocking process on iPhone 4 given in the previous post. Use this list and find the information you need. Also you can use this IMSI list to unlock any iPhone baseband with SAM unlock method here. Also here is an updated version of IMSI list. Check there too.

• Australia 3 IMSI: 085950600100263914
• Australia OPTUS IMSI: 085950200100263914
• Australia Vodafone IMSI : 085950300913535837
• Australia Vodafone IMSI:89610300000797611297
• Canada Bell IMSI: 083920163050027990
• Canada Fido IMSI :083920733000957260 ICCID:89302370200010929711
• Canada ROGERS IMSI:083920273050027990
• Canada Telus: IMSI: 083920223050027990
• Denmark Telia IMSI:082983020120779512
• France BOUYGTEL IMSI: 082980021331822130
• France Orange (SFR) IMSI: 082980011331822130
• France Orange IMSI: 082980101331822130
• Germany T-mobile IMSI: 082926105284204335
• Ireland O2 IMSI:082927201331822130
• Ireland Vodafone IMSI:082927101601498841
• Japan SoftBank:IMSI :084904026104810269 ICCID:8981200008280088190
• South Korea:89066764406538768965
• South Korea SK-show IMSI:084905806207609996
• New Zealand Vodafone IMSI:085903100943780192
• Spain Movistar IMSI:082941701331822130
• UK 3 IMSI: 082943021938636745
• UK O2 IMSI : 082943011938636745
• UK Orange IMSI : 082943330260828629
• UK T-Mobile IMSI: 082943031938636745
• UK Vodafone IMSI:082943510943780192
• USA ATT: 89014103211501404960

Here is global IMSI list updated on May 17.2011

• Australia OPTUS 85950205030644900
• Australia Telstra 85950104323374000
• Australia Vodafone 85950309781661800
• Austria T-mobile 82923308238761300
• Bangladesh Grameenphone 84907109253030600
• Belgium Mobistar 82960014984062300
• Brazil TIM 87942200870133500
• Brazil Claro 87942508810037900
• Brazil Vivo 87942111800426200
• Brazil Oi 87942131512191500
• Canada Fido 83920734010511600
• Canada Telus 83920221030457900
• Canada Rogers 83920273030457900
• Canada Bell / Virgin 839201603891080000
• Canada Bell / Virgin 839204608310510000
• Canada Bell / Virgin 839208807755670000
• France Orange 82980008682627300
• France Orange 82980105922332000
• France Orange 82980202525247800
• Germany T-Mobile 82926107047053900
• Germany T-Mobile 82926608037579400
• Ireland Vodafone 82943510926726200
• Ireland O2 82927208410252900
• Japan Softbank 84904021811017200
• Korea KT Show 84905808127038100
• Luxembourg Orange 82907993579988000
• Montenegro T-mobile 82979206860152300
• Nigeria Glo 86912059334505400
• Nigeria MTN 86912030803757900
• Nigeria Zain 86912023341059100
• pakistan ufone 84901300330139400
• Pakistan mobilink 84901100662941900
• Palestine Jawal 84932509211140500
• Paraguay VOX 89744109224345800
• Singapore Singtel 85952107950121300
• Singapore M1 85952304911541000
• Singapore Star Hub 85952509226811300
• South Africa vodacom 86955103002814200
• South Africa MTN 86955010300760900
• Spain Movistar 82941705820086300
• Spain Orange 82941703302584900
• Sweden Telenor 82904805860152000
• UK orange 82943333410591700
• UK O2 82943019334505400
• UK Vodafone 82943510973345600
• USA AT&T 83901141084102500
• USA AT&T 83901308083901900
• USA AT&T 83901900083901800
• USA AT&T 83901510083901800
• USA AT&T 83901830083901600
• USA AT&T 83901140083901300
• USA AT&T 83901650083901900
• USA AT&T 83901860083901800
• USA AT&T 83901890823354900
• USA AT&T 83901990228745500
• Yoigo 82941401010735600

That's it. If found your region and related service provider you could finish iPhone 4 unlock. Update: Check out my new and full list of IMSI numbers and find your code. Update 2: After you've found your IMSI number and network you can also check in this IMEI unlock carrier list if your iPhone can be unlocked for free! Good luck in your Sim card re-writing and iPhone unlocking.