Vodafone UK today began sending out text messages to iPhone 4S owners on its network instructing them not to upgrade to iOS 6.1 due to issues with 3G performance. iOS 6.1 was released to the public on January 28.
If you've not already downloaded iOS 6.1 for your iPhone 4s, please hold off for the next version while Apple fixes 3G performance issues. Thanks
Update: Vodafone has now posted a notice on its support forums addressing the issue.
(Thanks, Martin!)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.
Article Link: Vodafone UK Warning iPhone 4S Users Not to Upgrade to iOS 6.1 Due to 3G Issues