There are 2 ways to learn:
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Look at your iPhone’s model number, which is indicated on the reverse side of your device’s packaging (barcode part).
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Go to Settings > General > About (“model” item).
1 or 2 letters after the numbers to the “/” symbol (6th or 6-7th symbol in your model’s number) specify market and warranty service region.
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B - Great Britain and Ireland (“O2” operator -> locked) / iPhone 4 can be either locked or unlocked.
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BZ - Brazil (“Claro” and “VIVO” operators -> locked).
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С - Canada (“Fido” and “Rogers” operators -> locked) / iPhone 4 can be either locked or unlocked.
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СZ - Czech Republic (“O2”, “T-Mobile” and “Vodafone” operators -> unlocked).
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DN - Austria, Germany, Netherlands (“T-Mobile” operator -> locked) / can be either locked or unlocked.
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E - Mexico (“Telcel” operator -> locked).
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EE - Estonia (“EMT” operator -> locked, but it’s possible to remove a sim lock under additional conditions).
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FD - Austria, Liechtenstein, Switzerland (“One” (Austria), “Orange” (Liechtenstein, Switzerland) and “Swisscom” (Liechtenstein, Switzerland) operators -> locked, but it’s possible to remove a sim lock under additional conditions).
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GR - Greece (“Vodafone” operator, unlocked).
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HN - India (“Airtel” and “Vodafone” operators -> locked).
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J - Japan (“SoftBank” operator -> locked).
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KN - Denmark and Norway (“Telia” (Denmark) and “NetcCom” (Norway) operators -> locked).
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KS - Finland and Sweden (“Telia” (Sweden) and “Sonera” (Finland) operators -> locked).
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LA - Guatemala, Honduras, Columbia, Peru, Salvador, Ecuador (“Comcel” (Columbia), “Claro” (Honduras, Guatemala, Peru, Salvador), “Movistar”, “Porta” (Ecuador) and “TM SAC” (Peru) operators -> locked, but it’s possible to remove a sim lock under additional conditions).
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LE - Argentina (“Claro” and “Movistar” operators -> locked, but it’s possible to remove a sim lock under additional conditions).
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LL - USA (“AT&T” operator -> locked).
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LТ - Lithuania (“Omnitel” operator -> locked).
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LV - Latvia (“LMT” operator -> locked, but it’s possible to remove a sim lock under additional conditions).
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LZ - Paraguay, Chile, Uruguay (“CTI Movil” (Paraguay, Uruguay), “Claro” (Chile), “Movistar” (Uruguay) and “TMC” (Chile) operators -> locked, but it’s possible to remove a sim lock under additional conditions).
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MG - Hungary (“T-Mobile” operators -> locked, but it’s possible to remove a sim lock under additional conditions).
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NF - Belgium, France (“Mobistar” (Belgium) and “Orange” (France) operators -> locked, but it’s possible to remove a sim lock under additional conditions). Luxembourg (“Vox Mobile” operator -> unlocked).
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PL - Poland (“Era” and “Orange” operators -> locked, but it’s possible to remove a sim lock under additional conditions).
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PO - Portugal (“Optimus” and “Vodafone” operators -> locked).
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PP - Philippines (“Globe” operator -> locked).
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RO - Romania (“Orange” operator -> locked, but it’s possible to remove a sim lock under additional conditions).
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RS - Russia (“VimpelCom”, “MegaFon” and “MTS” operators -> unlocked).
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SL - Slovakia (“Orange” operator -> unlocked; “T-Mobile” -> locked).
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SO - Republic of South Africa (“Vodacom” operator -> unlocked).
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T - Italy (“TIM” and “Vodafone” operators -> unlocked).
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TU - Turkey (“Vodafone” operator -> locked, “TurkCell” -> unlocked).
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X - Australia (“Optus” (Australia), “Telstra” (Australia) and “Vodafone” operators -> locked, but it’s possible to remove a sim lock under additional conditions).
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X - New Zealand (“Vodafone” operator -> unlocked).
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Y - Spain (“Movistar” operator -> locked).
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ZA - Singapore (“SingTel” operator -> unlocked).
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ZP - Hong Kong and Macao (“Three” operator -> unlocked).