I had my iphone4 about 2 months I never use a case or bumper I am aware of the signal problem where you hold down the bottom corner you lose signal. I tend to lose signal/no service when im in my house especially next to my 2 pc. I was wondering does wireless router and usb effect the signal on iphone? My signal is fine in public. Funny enough is has happen to my old phone as well SE w995 always lose signal next to my pc My sister also have a iphone as well no case or bumper she also gets no service but not as frequent as mine. I done the network reset thing no help, I wont say it a big problem just annoying that I have to stand next to the window always from my pc to make calls to friends etc..
wireless interference is a real thing and it does cause signal lose but you must have like a lot of wireless stuff running through your house to make it drop cell signals.... or it could just be the structure of your house/building that causes poor reception....
Well ive been living here for like nearly 15 years I think it would be abit late to say the building beside the walls are like paper thin everything creeks in my house soon it'll fall apart lol UK house sucks I have 2 pc 1 laptop 3 phone 1 pod touch xbox360 all connected wireless xbox not always on but the 2 pc and laptop nearly on 24/7. My sister and bro's phone connected to wifi but most the time they dont play on their phone anyway just on standbye. Mum on ipod frequently. It a weird problems when I had my SE W995 It happen as well even when I change phone and brand new sim card now iPhone4 the problems is still here I think maybe my neighbour is building a secret weapon or something interfering me lol I mean this only started happening around a year ago. How come my house all of sudden be a black spot for signal I mean only me had the problem my bro blackberry phone and parent world war 1 phone all fine what are the chance of me getting multiple sim card all faulty, getting iphone 4 also faulty signal?