New answers tagged ios-5
http://www.cultofmac.com/225244/apple-decides-not-to-kill-always-on-vpn-for-ios-devices/ hopefully this will help you.
Which version of the iPad do you have? Not every version is compatible with every version of iOS; in particular, the first-generation iPad cannot be upgraded to iOS 6+. If that's what you've got, 5.1.1 is the latest version your device supports. See this table on EveryMac for details of which versions are compatible with which operating systems.
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