Although the problems have been reported on discussion forums, Vodafone UK issued an advisory last night telling people not to install the upgrade.
Vodafone added that following the upgrade, some customers appear to occasionally experience difficulty in connecting to the network to make or receive calls or texts or to connect to the Internet.
The main problem though appears to be a huge drain on the battery life and some reports of overheating, probably caused by the heavy battery drain.
Some owners have reported a one-third increase in how fast the battery is being emptied, although some other users have reported a mild improvement in performance, leading to some speculation that the problem is an incompatibility with one or more popular mobile Apps that are now triggering an unexpected software conflict.
Some other reports suggest a specific issue with how the upgraded OS is connecting to Exchange mail servers and is getting stuck in a power consuming loop. Some users, but not all have found that deleting and reinstalling their Exchange accounts fixes the problem.
Apple told Vodafone that it is working on fixing the problem, although they haven't issued a public statement at the time.
On the web: Vodafone Warning - Apple Forums
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