(Updated with new iOS 6.1.1 rumors)
Carriers Vodafone UK and 3 Austria have issued statements elaborating on problems with the iPhone 4S and iOS 6.1
. "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 [sic]," Vodafone's notice begins
"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 the problem has been fixed," the carrier continues.
3 Austria is also advising against upgrading to v6.1 on a 4S, but adds
that it's "working with Apple on a solution to the problem." Vodafone has previously indicated that the next version of iOS should solve 3G troubles; that update is v6.1.1, which is already in testing
Update: iFun says
that carriers have already finished testing v6.1.1, and that a 23MB build labeled 10B145 should soon be ready as an over-the-air update.