Is it possible to connect a iOS device automatically to a network, so I dont have do it manually?
You're allowed to use network if the user has configured it but beyond that if the user has not used the built in networking tools to establish a connection AIR isn't going to auto-connect to any network. I only have an iPad3/iPhone4S but both of those by default will connect to an open (non-protected) network by default after promting the user.
After the user establishes a connection to the network they can specify to use that network any time it's in range. All my iOS (iPad 1/2/3, iPhone 4S, iPod) connect to my wifi automatically.