Upgrade To iOS 5 Without SIM Card And Keep The Unlock Safe
Once the new operating system from Apple is made available, everyone wants to download iOS 5 and get the advantages of it. If you are not concerned about jailbreaking iphones or unlocking, you can go ahead and download iOS 5 directly from iTunes and update your iPhone. Without jailbreaking and unlocking, you don't have to worry about upgrading your baseband and you should be happy with the carrier contract. However, those who want iOS 5 bb 4.10.01 jailbreak and pwnage tools 4.3.5 4.10.01 should be very careful while upgrading to iOS 5. Fortunately, upgrading to iOS 5 without SIM card is possible and using this, you can easily upgrade iOS while keeping the unlock safe.
Unlocking iOS 5 Firmware
There are methods available to upgrade to iOS 5 without SIM card and these
methods help you to keep your iPhone unlocked. Now, before trying to unlock iOS
5 firmware, you should understand the possibilities. As long as you own iPhone
4, 3GS or 3G, you can enjoy iOS 5 bb 4.10.01 jailbreak and unlock using
software and hardware tools. Ultrasn0w is available to unlock iOS 5 in the
software way or you can go with GeveySIM unlock method if you prefer hardware
unlocking. The advantage with GeveySIM unlock method is that you don't have to
jailbreak your iPhone. Those who want to know how can I unlock the iPhone 4S
without jailbreaking it should be happy with GeveySIM method.
Supported basebands
While it is nice to have choices for the question is it possible to unlock
iPhone 4S, you really don't have much of a choice if you can't control the
baseband. Ultrasn0w is useful to unlock iPhones with lower basebands while
GeveySIM works for newer basebands. These basebands are limited and that is why
you won't have much of a choice when you don't control the baseband of your
iPhone firmware. GeveySIM works with basebands 01.59 to 02.10 and all basebands
from 03.10.01 to 04.10.01 basebands. Ultrasn0w on the other hand supports
specific basebands like 4.26.08, 05.11.07, 05.13.04, 05.12.01, 06.15.00,
01.59.00 and 04.10.01 until now.
Employ Caution While Upgrading to iOS 5
Even though iOS 5 is tempting enough, you shouldn’t just plunge into action to upgrade to iOS 5. It is important to understand the type of unlocking method you use and the basebands supported. If you upgrade in the official way using iTunes, you will end up upgrading your baseband. That is why people prefer to use iOS 5 bb 4.10.01 jailbreak and pwnage tools 4.3.5 04.10.01 to preserve baseband and jailbreak to use Ultrsn0w. Fortunately, you can upgrade to iOS 5 without SIM card and continue to use GeveySIM method, but it requires a few steps.
Upgrade to iOS 5 without SIM card
In order to preserve baseband, you should first build a custom firmware and
then use the restore option of iTunes to upgrade to iOS 5 and preserve baseband
at the same time. In order to do this, you need to use Redsn0w 0.9.9b5 which
will build custom firmware for you. Then you have to use Pwned DFU option to
put your iPhone in DFU mode and restore using iTunes by selecting the custom
firmware. Redsn0w can only be used in Mac machines as far as 0.9.9b5 version is
concerned. You can however use Sn0wbreeze on Windows machine and do the same.
Unlock with iOS 5
Once you upgrade to iOS 5 without SIM card, your baseband will be preserved by
the jailbreaking tool. Essentially, you won't jailbreak the iPhone and just use
the custom ipsw feature to protect baseband. Then, you can use the same
GeveySIM that you used before upgrading to iOS 5 and continue to unlock the iPhone once
again,