How to switch the primary iCloud account on my iPhone 4? I have recently upgraded an iPhone 4 to iOS 5.1 and when asked i registered it with Account A for both iCloud &amp; iTunes. 

However i also use Account A on my iPhone 4S and thus wish to switch the the iCloud account to a brand new Account B (keeping Account A for iTunes as all the apps are purchased on it).

Is this possible? The iCloud screen in settings does not let me change the Apple ID?
Open the Mail, Contacts, Calendars section and find the iCloud
account.
Select it.
Press "Delete Account".
Select "Delete".
Select "Add Account…"
Select "iCloud".
Log in.


This works on iPad; I assume it's the same for all other current iOS devices.