How to unlock iPhone 3GS or iPhone 3G? Many people ask this question who want to use unofficial SIM card on their phone. If you want to unlock your iPhone on your desired carrier, you will need to jailbreak it first.
You can jailbreak your iPhone either using Redsn0w jailbreak tool or Sn0wbreeze tool. After you have successfully jailbroken, you will need to check which baseband/modem firmware version you have got into your phone. To check that, go to Settings >> General >> About >> Model Firmware. If your iPhone’s modem firmware (baseband) is one of the following, you can easily unlock it using ultrasn0w software unlocking tool.
What if your baseband is not one of those mentioned above? Well, the only option remains to unlock your iPhone 3G/3GS is to flash iPad’s baseband or to get IMEI unlocking.
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