The warnings come amidst some complaints from iPhone 4S users who have updated to iOS 6.1. Vodafone in the UK is urging iPhone 4S users to refrain from updating to iOS 6.1 - released in January - until Apple has released a fix for the problem.
In Austria, the 3 network has also reportedly warned its iPhone 4S users against the update.
"The update of the iPhone 4S on iOS 6.1 can currently cause connectivity problems. We responded quickly and are working with Apple on a solution to the problem," 3 in Austria has warned customers.
"For this reason, we recommend not to install the update for the time being. We will inform you immediately if there is a solution. Your 3 ServiceTeam."
In the UK, Vodafone contacted its iPhone 4S users via SMS, as shown below.
Are you having trouble with iOS 6.1??
Written by: James Delahunty @ 10 Feb 2013 7:30
