According to Sherif Hashim (@sherif_hashim), the famous iPhone baseband hacker, iOS 4.0.2 do not upgrade your iPhone’s baseband and hence you can unlock your iPhone on iOS 4.0.2 with the latest version of Ultrasn0w. So far Redsn0w(v0.9.5b5-5) can jailbreak iOS 4.0.2 on iPhone 3G and iPod Touch 2G(non-MC models), so you can only unlock iPhone 3G with Ultrasn0w 1.1-1.

iPhone Dev Team has released Ultrasn0w v1.1-1, an update to Ultrasn0w v1.0-1. iPhone Dev Team has tweaked few things which will ensure better battery life, performance and more stability on all iPhone 4 devices. Like the previous release, Ultrasn0w v1.1-1 can unlock iPhone 4 running iOS 4.0 / 4.0.1 with 01.59.00 baseband and iPhone 3G, 3GS with 04.26.08, 05.11.07, 05.12.01 or 05.13.04 baseband version.

As promised, iPhone Dev Team has released their much awaited version of Ultrasn0w (v1.0-1) which can unlock iPhone 4 running iOS 4.0 / 4.0.1 with 01.59.00 baseband and iPhone 3G, 3GS with 04.26.08, 05.11.07, 05.12.01 or 05.13.04 baseband version. Once you have jailbreaked your iPhone by using JailbreakMe, you can follow the step-by-step procedure below to unlock your iPhone 4, 3GS, 3G.

Yup its true! Updating your iPhone to iOS 4.1 beta 2 (Jailbreakable) will upgrade its baseband to 05.14.01 which cannot be unlocked using Ultrasn0w 0.93. Apple patched the exploit which enabled Ultrasn0w 0.93 to unlock iPhone 3G, 3GS running iOS 4.0 / iOS 4.0.1 with baseband 04.26.08, 05.11.07, 05.12.01 and 05.13.04.

Previously, @planetbeing (member of iPhone Dev-Team) showed his unlocked iPhone 4 with Ultrasn0w and now another member of the team @MuscleNerd has confirmed that he has successfully unlocked his iPhone 4 with Ultrasn0w. @MuscleNerd showed a picture of his iPhone 4 camped on T-Mobile’s network.

Dev-Team’s quest for unlocking iPhone 4 continues. Dev-Team has posted a new article on its official blog titled ultrasn0w is growing!. The article states that they have successfully accomplished carrier unlock on iPhone 4 with Utlrasn0w tool and they are now in the process of fine tuning the tool for public release.

Upgrading your iPhone 3G, iPhone 3GS and iPhone 4 to iOS 4.0.1 will not upgrade the baseband from 05.13.04 to any newer version. But unfortunately, there is no jailbreak tool available at the moment which could jailbreak iOS 4.0.1 on iPhone 3GS and iPhone 4, so the only device you can jailbreak using Redsn0w is iPhone 3G. The following step-by-step guide will explain you how to unlock your iPhone 3G on iOS 4.0.1.

iPhone Dev Team has released Ultrasn0w 0.93 which is fully capable of unlocking iPhone 3G / 3GS running latest iOS 4.0. Previously iPhone Dev Team released Ultrasn0w 0.92.1 which could unlock iPhone 3G / 3GS with baseband 04.26.08. However this version of Ultrasn0w can unlock iPhone 3G / 3GS with baseband 04.26.08, 05.11.07, 05.12.01 and latest 05.13.04. Please follow our step by step guide below to unlock iPhone 3G/3GS running iOS 4.0.

Couple of days ago MuscleNerd, member of iPhone Dev Team tweeted that they will be going to release a tool which will unlock iPhone OS 3.1.3 baseband 05.12.08 in June as soon as the new iPhone 4 comes out. Yup! Its finally here. Ultrasn0w 0.93 has been released by iPhone Dev Team and is fully capable of unlocking iPhone 3G and 3GS running iPhone OS 3.1.3 baseband 05.12.08. Follow our step by step guide below to unlock iPhone 3G / 3GS running iPhone OS 3.1.3 baseband 05.12.08.

iPhone Dev Team has released updated version of Ultrasn0w named “Ultrasn0w 0.92.1″ to unlock iOS 4.0 on iPhone 3GS, 3G with baseband 04.26.08.
Please note that your device should be on baseband 04.26.08 and running iOS 4 GM build to proceed with unlock using ultrasn0w 0.92.1. If you are on baseband 05.11.07, you can use blacksn0w RC2 to unlock and if you are on baseband 05.12.01, you will have to wait a little longer as Dev-Team is holding the release of unlock tool till iOS 4 public release officially hit the market.