Vodafone has warned Apple iPhone 4S users on its network not to upgrade the device to the iOS 6.1 update, following the discovery of a bug affecting the handset's 3G connectivity.
The mobile operator posted a warning online on Friday, confirming Apple was aware of the issue and is already working on a fix.
"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," Vodafone said in a statement.
"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."
At the time of publishing Apple had not responded to V3's request for comment.
According to Vodafone some users have reported a bug that impedes iPhone 4S's connectivity in a number of ways.
"Some customers may occasionally experience difficulty in connecting to the network to make or receive calls or texts or to connect to the internet. These connection problems are intermittent," Vodafone warned.
Apple released the iOS 6.1 update late in January. The update was designed to fix a slew of vulnerabilities in the iOS operating system, expand language support for the Siri personal assistant tool and add LTE wireless broadband capabilities.
V3 contacted Three, EE and O2 asking if their customers were experiencing similar issues but had received no reply at time of publication.