If we upgrade a carrier unlocked iPhone 3G or 3G S to iOS 4.2.1 firmware or any other version it will lose its activation and become unusable. Those people who bought unlocked iPhone models will get into trouble if they upgrade to new iOS without checking for the availability of compatible jailbreak/unlock tools. The iPhone will then keep itself locked at the “No SIM card inserted” message and with a connect to iTunes screen. And another message ” The SIM card inserted in this iPhone doesn’t appear to be supported” when we connect the device to iTunes. That means you have to get the original carrier SIM card to activate the iPhone 3G or 3G S again. But you can override this using activation of hactivation tools designed for the specific iOS version. Thanks to the iPhone-dev team and other iOS hackers around the world. Now we can fix SIM not supported message in iPhone 3G and 3GS after iOS 4.2.1 firmware upgrade too.

The iPhone Dev-team has managed to provide a working unlock and jailbreak solutions for iPhone 3G and 3GS, just a week after the iOS 4.2.1 firmware releases. They first released Redsn0w 0.9.6 b4 untethered/ tethered jailbreak. And then PwnageTool 4.1.3 and Redsn0w 0.9.6 b5 unlock tools for Mac and Windows. Currently, these iOS 4.2.1 unlock works with iPhone 3G and 3G S models with baseband higher than 05.14.02. They use iPad OS 3.2.2 to upgrade the modem firmware of the target device to 06.15.00, so that it is compatible with Ultrasn0w 1.2 unlock through Cydia.

iOS 4.2.1

As expected, Apple today rolled out the iOS 4.2.1 firmware. The iOS 4.2 firmware is available for iPhone 4, iPhone 3G S, iPhone 3G, iPad 3G, iPad WiFi, iPod Touch 4G, iPod Touch 3G and some other devices. Among all devices, iPad is the biggest beneficiary of the iOS 4.2.1 firmware update. Apple iPad users can now enjoy multi-tasking, folders, Game Center and other iOS 4.0 features with the new firmware update. Apart from this, they will also get some new feature like AirPlay, AirPrint, etc., that are specially designed of firmware 4.2. The fourth generation Apple device’s iPhone 4 and iPod Touch 4G users will be happier with the OS 4.2 announcement. Now they don’t need to spend an extra amount for buying the MobileMe phone tracking service. The new Find My iPhone feature introduced in iOS 4.2.1 firmware will do it for free.

Tata Docomo 3G

Tata Docomo has officially launched their 3G services in India. They have become the first commercial mobile carrier in India to launch 3G. Tata Docomo’s partner NTT Docomo is the pioneer of 3G in the world. So the Docomo 3G deployment in India was pretty smooth and fast. Tata Docomo has a HSPA+ 3G network which is capable of delivering 3G speeds up-to 21mbps. Docomo 3G is currently available in selected cities of states where they have won the license. Existing Tata Docomo customers with any GPRS pack can access 3G services in their mobile, free (100MB) for the coming seven days. The 3G tariff plans and other offers will be announced after this introductory offer. With 3G, users can access high speed internet and HD video steaming in their mobile devices. They can also make high quality video and audio calls to other 3G enabled handsets. The speed of the 3G and facilities varies with the handset used and service area.

Blackberry playbook

Research In Motion finally announced the most awaited tablet computer and iPad competitor BlackBerry Playbook. Earlier known as the BlackPad, Blackberry playbook was expected to include a tablet version of the newly announced BlackBerry OS 6.0. Instead of that, RIM moved to a new UNIX based OS platform called QNX, which was further optimized to work on tablet computers and mobile devices. The advantage of QNX is that it is a real-time operating system that provides true multi-tasking. Playbook is also the first web tablet to get a dual core mobile CPU. Here is a comparison of the software and hardware features of Blackberry Playbook  with Apple iPad.

Activate BSNL 3G in iPhone

Apple mobile devices like iPhone 4, iPhone 3G and iPhone 3G S are usually sold in contract basis. The iPhone user needs to be on a particular data plan of the carrier to connect to the internet – also there are certain restrictions on tethering. In India, Vodafone and Airtel are the only mobile phone carriers who officially support iPhone. Users in other networks like BSNL, IDEA, Tata Docomo, Aircel, Reliance, etc. will need to jailbreak, unlock their iPhone 4, 3G or 3G S for getting connected to 3G, EDE or GPRS by other providers. In this post, we will tell how you can activate BSNL 3G/EDGE/GPRS settings in iPhone 4. The method can also be used in iPhone 3G and 3G S.