How can you tell if you’ve got an MDM or not?

Go to Settings > General > VPN & Device Management. Do you see anything in there?

Is it a company owned phone?

Did you allow your employer or school to enroll it in an MDM?

Did you buy a used phone you suspect is managed by an MDM?

*to add to the question about controlling what can be downloaded from iOS updates, is there a way that the administrator can root an overlay to the users phone so that some features not be available or would that be something done by the apple device manufacturers in 2020 for the iPhone security bounty(SRD or ARD) which ever acronym used for it currently that apple developer sent to third party researchers?? And if anyone knows about that device is it possible for that device to make your phone a user phone and the ARD/SRD device become the main phone being able to monitor or finalize all texts and emails sent out?? There are times I can send emails and I hear the whoosh sound immediately and other times I do not hear that noise as is my text and emails are on delay and it has been this way since June of 2020 plus a lot of other issues that don’t make sense like pin verification when calling apple support I haven’t received that in years now either?. Any help or advice would be greatly appreciated!!

Can the administrators phone be able to limit what updates are downloaded to your phone, so when running on iOS 17.0.3 not all of the features be available to my phone?