For the past twelve days my only access to UE has been through my Samsung Galaxy 3 running android 4.1.1. At first I was able to post in the forums, but then my ability to post ended and I began receiving an error message intelligible only to someone with access to the app source code. Upon returning to civilization I learned that my ability to reply to threads was blocked because I had not agreed to the forum rules.
I suggest the android app needs work on its error messages.
Retired English Teacher