Two weeks after the release of iOS 6.1, Apple rolled out another update specifically for the iPhone 4S.

This update is really critical because according to Apple, it is supposed to address an “issue that could impact cellular performance and reliability”.

The “performance and reliability issues” are related to sending text messages, connecting to your cellular network, and also something related to Microsoft Exchange.

European carriers in particular Vodafone UK sent out warning to its customers not to update their iPhone 4S without waiting for this patch. Hopefully, this patch will help sort out affected customers.

Due to the critical nature of this 23MB update, Apple probably didn’t spend any time patching the untethered jailbreak exploits found in iOS 6.x, which means it’s safe for iPhone 4S users to continue updating to iOS 6.1.1 and jailbreak it with evasi0n 1.3.

Meanwhile, the baseband is now updated to 3.4.02 and as usual, there’s won’t be any ultrasn0w or any “free” unlock available for this baseband. An official unlock is by far the best solution for now.

Here’s a direct download iOS 6.1.1 10B145 for iPhone 4S hosted on Apple’s server.

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