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We’re aware of an issue caused by Apple iPhone 4s handsets that have been upgraded to iOS 6.1 which impacts performance on 3G.
Some customers may occasionally experience difficulty in connecting to the network to make or receive calls or texts or to connect to the Internet. Apple is working on a solution to their software issue. These connection problems are intermittent.
While Apple’s investigations continue, we would recommend that anyone who has not yet installed iOS 6.1 on their iPhone 4s should delay doing so until Apple has confirmed that their problem has been fixed.
Apple has released a new version of its iPhone software that fixes the 3G performance issues that have been affecting users of the iPhone 4s who had installed iOS 6.1.
Please download the latest version – iOS 6.1.1 – from Apple as soon as you can by switching your iPhone 4S off and on again and then installing the latest firmware.