Not sure its the phone and I think I need to clarify something here. I got the instructions and the tech spec stuff from a class we attended where we heard about how the sling adapter worked. I guess I assumed too much. The sling adapter takes over TV2 and if in single mode there is no TV2. That being said, single mode plays like TV1 is using the second tuner as well (or at least it is seen that way by the app) and therefore there is not legitimate all-access control over the box. You are basically accessing it as PIP. When on TV1 and PIP is up, get the PIP to change to a DVR event without toggling what's on the main screen. The issue here is not the capability of the adapter, it is the capability of the box which has been that way since inception. The app, when the box is in single mode, is basically a remote to change the PIP channel. I will say I was not aware of any "auto-change" function on the receiver and perhaps that may be a step in determining if the receiver sees the device or not. Attaching the adapter while in single mode, as you put it, should make it automatically drop out of single mode to dual. I did not see anything on this end about it doing that but hey, our instructions and yours are apparently different. I do not think the Iphone has any limits to using this app at all, but I know that some problems are specific to that platform, just as some are specific to Android or Windows platform phones. I have been working on an account that can access the app through any other mobile device and get it on a PC but the app on the Iphone and Ipad (his two devices or the two I have access to) crashes after the point when it checks settings. Other accounts on the same device work fine. So right now on that platform, I am looking into a specific conflict between his account, the app, and those two devices. Talk about strange.