keep more than one iphone in sync

Hi Guys,

So I have 2 iphones and wanted to know how I could keep them both in sync.. SMS, Mail, Contacts, Apps, Music,Videos. Basically keeping them both identical..
Any ideal

so basically your trying to do the "sync with multiple computers" thing just in reverse?

have you tried taking one iphone with the more useless info, hitting reset everything, reconnecting to itunes, and restoring from a backup of your other iphone?

yup, av done that..so I have two identical iphones info wise but there after how do I keep them both in sync. all through the same computer though