I recently replaced the broken glass on my ZTE Blade Max View and it seems to work fine, but I have a question: Inside there's a flat piece of copper foil. I think it's probably an RF shield. Well, I'm not sure if I positioned it correctly and it might be critical to proper reception. It does seem to work ok, but maybe not as well as it should. Haven't been able to see pics of the insides of this model. Any ideas much appreciated.