I have an app where I want to send mail.I have a button where it directs to the MailComposer sheet,It works pretty well in my simulator but can't send the mail so I need to use the device my problem was every time I clicked the button to direct it's mail composer the device doesn't support the MFMailComposer sheet, the device that I was using was a 3G iphone.
Check if the device has at least one mail account added.