I upgraded my iPhone 6S to iOS 9.3 today and now there appears a message on my lock screen
This iPhone is managed by your organization.
Of course, I already knew that - it's a company phone! I don't want to see this message on my lock screen every day, how can I acknowledge the message and disable it?
Someone else mentioned how to remove the management profile from the phone. That has some potential issues:
As far as leaving the profile there, it's very likely that you can't remove the message because a lot of people are used to their personal iPhones being secure and private and they need to be informed when their privacy may be at stake because they may be being watched.
If they're issued a work phone, they may incorrectly assume that the security and privacy are just as good as their own iPhone.
If they let an untrustworthy acquaintance use their personal iPhone, they may have no idea that it's even possible for the acquaintance to take a few minutes to begin managing the phone and to then spy on them later.
Imagine if the boss or the untrustworthy acquaintance could just turn off the warning right after beginning to manage the phone. The user of the phone would then be kept in the dark about potential spying.
There's no easy way for an iPhone to distinguish between a spy disabling the message and the user disabling the message, so there's no easy way to allow for what you want while still ensuring users receive that vital information.
According to the 9-to-5-Mac Blog, the message is simply is alerting you that your iPhone has a profile installed using the MDM program. These are files inside your phone called .mobileconfig. I've linked above to a cached version of this blog, from Google.
These are mostly used to control which preferences and applications you have enabled by default, although there are nearly unlimited advanced uses. For example your company could easily erase or lock your phone, if desired. For readers' future reference, you can also create your own profiles or use 3rd party profiles, not just get one from a company.
Depending on the settings of the profile you may be able to remove the profile without your company's consent, although that might not make them happy:
Go into Settings and look at the settings for Profiles. You can remove the profile from there, if your company is not blocking you from removing profiles. This may not only make the message go away, but also modify the look and feel of your phone, as well as, remove things you need, like automatic access to company VPNs or wi-fi networks.
There may be a setting within the MDM from your company, that with their admin tools (even just a simple tweak in Profile Manager) where they can disable this message that you don't like; I would say just ask about it. The blog above speculates that this feature has been added because soon there may be more ways implemented for companies to track employees using their managed iphones, in addition to the many already-possible ways to track people using iPhones or other cell phones, such as using GPS.
