Recently I ordered for my first Sanyo phone a Sanyo Zio. Two days ago I was really excited to get my new Sanyo ZIO but after I have heard about its network reception problems I am a bit tensed about it? Can anyone tell me is it a major problem? What is Sanyo’s response on it? I have heard that there is a special bumper case needed to overcome that problem. Is it true? Is that case being sold other than the phone?