I fixed it by uninstalling DMC, then reinstalling it. Works fine now. Thank you for all your suggestions,  for me.
Hi, I have a Inspiron 5490 AIO and until this morning I was able to use the DMC (Dell Mobile Connect) feature. I performed an updated to my desktop and when I try to connect my phone, I receive and error message stating that the Mobile Connect App on my phone is out of date. I currently have version 3.1.0. installed on my iPhone, which is the latest. Is anyone else having this issue? I contact support and they told me it was a software issue and for $99 they will fix it.  
Inspiron 5490 AIO, DMC App out of date