It was at that point that I informed my manager that I would no longer be checking work e-mail and instant messages on my mobile device unless the company chose to pay for a company-owned device and require that I carry it. My manager told me that he intended to do the exact same thing. Informal surveys of my group show that about 80% of the group are not following work e-mail or IMs when away from work computers.
I am happy that this is the case but am also disappointed that the remaining 20% are almost entirely the "burn the candle at both ends" segment of our group and they're forever replying to threads and the like even when off work on weekend or vacation.
I have read on multiple places that MDMs on an iPhone have quite restricted access (no SMS/iMessage, pictures, non-MDM e-mail, and the like) unless the device has been wiped and redone under the All Powerful MDM mode but I don't know if those people are correct or if they're all going from the same (possibly inaccurate) source. Therefore, I keep the MDM stuff off of my iPhone because it is mine and I have data from other unrelated projects and companies on it that is none of my employer's business nor theirs to have access to hoover up.