Am I able to do this on my iPhone4? How?
MacBook, Mac OS X (10.6.4), Original 1st Gen .Mac member
No - there is not an option to include a graphic/image attachment as a signature or as an attachment to your signature. Since the iPhone's Mail app supports composing in plain text only, it would be sent as an attachment if this were supported. All email clients do not support showing graphic/image attachments as inline or viewed in place within the of the message and if not, the recipient would need to select and open the attached file to see your signature as with any other file sent as an attachment to a message.