Icloud memory
I cannot purchase memory as 'an unknown error has occured - dismiss'. What do I do?
iPhone 3G, iOS 5.1.1
Make sure your iTunes billing information is correct.
Try purchasing from your Mac or Windows computer. If you do see an error, maybe it'll be a little easier to decipher.
iCloud: Purchasing iCloud Storage and Billing
Mac OS X
From the Apple () menu, choose System Preferences.
Click the iCloud icon.
Click Manage in the lower-right corner.
Click View Account in the lower-left corner.
Enter the password for your iCloud account, then click View Account and follow the prompts.
Windows 7 and Vista
Click the Start Menu and go to Control Panel.
Go to Network and Internet.
Click the iCloud icon.
Click Manage in the lower-right corner.
Click View Account in the lower-left corner.
Enter the password for your iCloud account, then click View Account and follow the prompts.
Note: You cannot update your payment information or manage your storage from iCloud.com.