Two mobile operators in Europe have told customers with an iPhone 4S to avoid updating the device to iOS 6.1, because of reports that the upgrade brings connectivity problems with it.

Vodafone UK claims Apple is working on a fix related to 3G connectivity. iOS 6.1 has been out for almost two weeks, so this comes a bit late. But if you’re in either vendor’s service area and you’re using a 4S, it may be a good idea to put off updating for now.