Wouldn't that defeat the purpose of countermail? I could see if the iphone has a memory card slot but it's memory is built in. I wouldn't think that there would be an app or anything of the sort because it defeats the security mechanism built into countermail.
Yeah, even if there were, it would counter the whole security rationale for using countermail in the first place. Guys who use their iphones to transact in conversations that need to be protected just baffle me. Iphones are pretty much law enforcement tools as much as they are phones.