For what Apple allows apps to do, this app succeeds – TeamViewer QuickSupport Review

There are a lot of negative reviews aimed at the developer because of the lack of screen sharing and control. This is a result of Apple's restrictions and isn't something TeamViewer or any other similar app can get around. The most they could do is explicitly state in their app description that it doesn't do screen sharing or control due to iOS restrictions. The person calling the developers scum because this free app doesn't let them work with their IT department is out of line.
Review by EX13520 on TeamViewer QuickSupport.