Dev-team has released the v1.2 of ultrasn0w that unlocks iOS 4.2.1 on iPhone 3G and iPhone 3GS with baseband 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00. iPhone 4 is not supported as it has different baseband.

Following are the complete guide and details to unlock iOS 4.2.1 on iPhone 3G and 3GS using ultrasn0w.

Important things to know before you go for this unlock:

1. The unlock is for iPhone 3G and iPhone 3GS with baseband 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00.
2. iOS 4.1 on baseband 05.14.02 and iOS 4.2.1 on baseband 05.15.04 are NOT SUPPORTED.
3. YOU CAN UPDATE YOUR BASEBAND to 6.15.00. Read this guide from RedmondPie for full details.
4. If you update to baseband 6.15.00, you won’t be able to downgrade the baseband.
5. It is HIGHLY RECOMMENDED that you should not upgrade your baseband to 6.15.00. Only do this if you are in need of unlock after updating to iOS 4.2.1 or you are suck with baseband 05.14 or 05.15.

The jailbreak for iOS 4.2.1 is now available via Redsn0w 0.9.4b4 by iPhone Dev Team. Here is the full step by step guide and details for jailbreaking iOS devices running iOS 4.2.1

Before you go for the guide, you must know:

- This jailbreak is for iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G and iPad running on iOS 4.2.1 only

- Except for iPhone 3G, iPhone 3GS old iBoot and iPod Touch 2G MB model, this jailbreak is tethered. That means every time you reboot your device, you will have to jailbreak it again.

- This will not unlock your iPhone. If your iPhone is not factory unlocked, don’t try this jailbreak because no unlock for iOS 4.2.1 is available yet.
Update 1: Unlock for iPhone 3G and 3GS on iOS 4.2.1 with baseband 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00 is available, click here for complete guide and details. Whereas the unlock for iPhone 4 on iOS 4.2.1 is not available yet so don’t go for this jailbreak if your iPhone 4 relies on software unlock.

- I will not be responsible for any loss of your device while attempting this jailbreak, do it on your own risk

ih8sn0w team has just released sn0wbreeze 2.1 that can jailbreak iPhone 3G, 3GS, 4 iPod Touch 2G, 3G, 4G and iPad and Apple TV.

Here are instructions to jailbreak iOS 4.1 on an iPhone, these instructions are almost same for all iOS devices.

Now your phone is your key. Clarion Hotel Stockholm (Sweden) is testing a pilot project to replace key rooms of the hotel with mobile phone.

UI Sketching and mockups is my favorite part. Once you create a mockup on Photoshop or any other editing tool, you always want to see it in action before you start bringing it to life. I just stumbled upon a very simple and lovely app called Mockibilly that let’s you demonstrate your iPhone app mockups on an iPhone. Check out this video, it explains all:

Apple just released iOS 4.2 to developers for all iOS devices. The jailbreak for iOS 4.2 can be made happen using Redsn0w 0.9.6b2. Here is the full step by step guide for jailbreaking iOS devices running iOS 4.2.

Before you go for the guide you must know:

- This jailbreak is for iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 2G, iPod Touch 3G, iPod Touch 4G and iPad running on iOS 4.2 only

- This will not unlock your iPhone. If your iPhone is not factory unlocked, don’t try this jailbreak because no unlock for iOS 4.2 is available yet.

- I will not be responsible for any loss of your device while attempting this jailbreak, do it on your own risk

iOS 4.2 GM (Gold Master) is out. Gold Master is like RTM (Release to Manufacturers) so in this case, developers enrolled in Apple’s standard or enterprise developer program can now download iOS 4.2 for their iPhone, iPod Touch and iPad.

Developers can download iOS 4.2 from here

Originally, the iPhone 3GS can record 640×480 videos @ 3Mbps. Mike Pan, after having a look at the ARM Cortex processor that the iPhone 3GS uses, discovered that iPhone 3GS can handle 720p encoding because of the capabilities of the processor. He was able to by pass the artificial limit that Apple has placed to enable the HD video recording. This method enables the non-standard resolution of 1080×800 for HD video recording. Mike opted this resolution to maintain the aspect ratio. Here is the sample video quality after enabling HD video recording on an iPhone 3GS.

Here is how to do it:

The newest release of Yahoo Messenger app enables Users to make free 3G voice and Video calls from there iPhones to any Yahoo Messenger account.

The App offers multitasking on the iPhone 3GS and iPhone 4, 3G / WiFi video calling (iPhone to iPhone, iPhone to Android or iPhone to PC/Mac) as well as receive instant notifications.

GeoHot is back in jailbreak business with this new tool called Limera1n. Limera1n can jailbreak iPhone 3GS, iPhone 4 and iPod Touch 3G & 4G. Dev team announced that they are going to release Greenpois0n jailbreak tool but it can only jailbreak iPhone 4, iPod touch 4 and iPad.

Following is the guide to jailbreak iPhone 4/3GS and iPod Touch 3G/4G running iOS 4.1 with Limera1n.