That is by design!

来源: 于 2012-02-27 12:10:11 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Now you understand why people hate Apple?!

You have to jailbreak in order to do desktop mirroring.

Only on iPad2 did Apple allow HDMI mirroring.

However, mirroring is generally not useful in most cases: Your iPhone's resolution is kind of different from TV, hence not so good for display anyway.