As for unlocking, most phones (here in the US, anyway) are “locked” to a particular network. In the iPhone’s case, that’s AT&T for the US, O2 for Great Britain, and so on. Should you want to use your iPhone with another GSM carrier, you need to unlock.

Unlocking lets you place calls with any GSM carrier by inserting different Subscriber Identity Modules (SIMs) into the phone. Normally these SIMs from unapproved carriers won’t work. When your iPhone is unlocked, just buy a local GSM-compatible SIM, place it in your phone, and make your calls. You’ll be able to use your iPhone around the globe without paying exorbitant roaming fees.

UNLOCK iPHONE 4S:

iPhone 4S with iOS Version 5.0 |

• Modem firmware: 01.00.11 –> is not unlockable at the moment





UNLOCK iPHONE 4:



iPhone 4 with iOS Version 5.0.0|

• Modem firmware: 04.11.08 –> is not unlockable at the moment
• Modem firmware: 04.10.01 –> is not unlockable at the moment
• Modem firmware: 03.00.03 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)






iPhone 4 with iOS Version 4.3.3 |

• Modem firmware: 04.10.01 –> is not unlockable at the moment
• Modem firmware: 03.10.01 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.3.2 |

• Modem firmware: 04.10.01 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.3.1 |

• Modem firmware: 04.10.01 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.3.0 |

• Modem firmware: 04.10.01 –> is not unlockable at the moment
• Modem firmware: 03.10.01 –> is not unlockable at the moment
• Modem firmware: 02.10.04 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.3.0 |

• Modem firmware: 04.10.01 –> is not unlockable at the moment
• Modem firmware: 03.10.01 –> is not unlockable at the moment
• Modem firmware: 02.10.04 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.2.1 |

• Modem firmware: 03.10.01 –> is not unlockable at the moment
• Modem firmware: 02.10.04 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.1.0 |

• Modem firmware: 02.10.04 –> is not unlockable at the moment
• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.0.2 |

• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.0.1 |

• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)



iPhone 4 with iOS Version 4.0.0 |

• Modem firmware: 01.59.00 –> Unlock with UltraSn0w 1.2.3 (guide)





UNLOCK iPHONE 3GS:



iPhone 3GS with iOS Version 5.0.0 |

• Modem firmware: 05.16.05 –> Sorry, but your iPhone is not unlockable at the moment.
• Modem firmware: 05.16.02 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.01 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.15.04 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.14.02–> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 04.26.08 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.11.07 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.12.01 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.13.04 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 06.15.00 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.3.3 |

• Modem firmware: 05.16.02 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.01 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.3.2 |

• Modem firmware: 06.15.00 –> Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.02 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.01 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.3.1 |

• Modem firmware: 06.15.00 –> Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.02 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.01 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.00 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.3.0 |

• Modem firmware: 06.15.00 –> Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.01 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.16.00 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.2.1 |

• Modem firmware: 06.15.00 –> Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.15.04 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.1.0 |

• Modem firmware: 06.15.00 –> Unlock with UltraSn0w 1.2.3
• Modem firmware: 05.14.02 –> update your baseband with this guide and Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.0.2 |

• Modem firmware: 05.13.04 –> Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.0.1 |

• Modem firmware: 05.13.04 –> Unlock with UltraSn0w 1.2.3

iPhone 3GS with iOS Version 4.0.0 |

• Modem firmware: 05.13.04 –> Unlock with UltraSn0w 1.2.3

How to find iPhone Baseband version:

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Related posts:

• UNLOCK IPHONE 3GS 5.0/5.1 with ULTRASN0W
• UNLOCK IPHONE 4 5.0/5.1 with ULTRASN0W
• UNLOCK 4.3.5 iPHONE 4, iPHONE 3GS. ULTRASN0W 1.2.3

Via iOS 7 Jailbreak Team