This is not a problem unless you would like to make some reversing for a good reasons :)
and at this point, knowing what method is actually called - kind of a key.
Not a problem any more, just have a look on helper IDC script for IDA which makes situation more transparent and works directly over arm binaries, so it makes from kind of unknown:
__text:000036B8 02 F0 92 EC BLX _objc_msgSend
something more obvious for the method call name:
__text:000036B8 02 F0 92 EC BLX _objc_msgSend ; @selector(getVertexSize)
Just note method name where app will land at.
IDC script in sources available at: https://github.com/x264msna/dearm_msgSend