Airplay button will not appear on iPhone 4? (APPLE TV 2nd GEN)

I have an Apple TV 2nd Gen with an iPhone 4. The airplay button does not appear on my iPhone in pictures or music or anything. It's nowhee to be seen. The Remote App won't even pick up the Home Sharing from the Apple TV for the remote to work.

Has ANYBODY got any kind of help? Please?

Apple are just not helpful on the phone so helpfully someone can help me here.

I've had this problem for a few weeks. I'mm all up-to-date on oth firmwares. I've tried turning off firewall etc...

ANY HELP?