Well, like many of people here I had the obnoxious signal loosing issue that is affecting a staggering amount of iPhone 4 users. However, I never realized I inadvertedly fixed the issue until just 10 minutes ago. I had signal issues since Day 1. Bear with me thru this small story. I saw here a thread on MacRumors about a user experiencing camera issues on his iPhone 4. Said issue was that the camera showed a green spot in the center. I was sorta curious but never really paid much attention to it. This was 4 days ago. Flash forward to yesterday. I was on the Apple Store picking out a new case for my iPhone 4, along with the respective screen protector. While I was doing that I saw an empty iPhone 4 demo unit and I decided to test drive FaceTime. I fired up both my iPhone 4 and the demo unit and connected. Disaster struck, my iPhone suffered from the same green spot effect as the iPhone from the user on MacRumors. Knowing full well, it was a hardware problem I set up an appointment for today at 6:30 PM. Flash forward to today 6:30 PM. I got there at 6:15 and the Genius helped me out right away. He saw the problem, diagnosed my phone and concluded as previously stated it was hardware problem. Obviously warranty kicks in. He takes out my Micro SIM card and puts in the new iPhone (this was a brand new, not refurb unit). He activates it and hands it to me for mini inspection. first thing I do is check the camera, and against ALL odds, the same issue plagued this new phone. The Genius and I were, to say the least, shocked. Same issue, different phone. Now, how does this relate to the signal loss? Well, I am getting there so hang on tight. The Genius does a comparisson between my iPhone and replacement unit to find the exact spot. He then pulls out his and does the comparisson to find his iPhone 4 too suffers from the dreaded green blob/spot. He then tells me there is no other replacement unit for my iPhone and that I had 2 choices. Take my current iPhone and wait if a software fix comes along, or take the replacement phone with me. I decided to wait and keep my phone (it is a hassle to resotre everything to previous state). So the Genius reswaped the SIM card to my phone back and handed it to me. (My iPhone spent 15 minutes with out SIM card while the Genius did all his tests on my and replacement unit, and while he asked for 2nd opinions on the green blob issue) I went on my merry way, but realized something now. No matter what position I held my iPhone 4 in, the signal never decreased. I held it the many ways I know the signal issue pops and nothing. No bar loss, no signal loss, no call drop. NOTHING. So there you have it. I am theorizing that moving the SIM card had something to do with the signal issue, because the only thing I have done to my iPhone 4 differently is take out and reinsert the SIM card. Other than that no other changes to it. No setting change, no software change no nothing. Just reinsertion of the SIM card. Now, to prove my theory, I need people who can test this and see if this fixes their iPhone. I know it did on mine, but on yours? Check it out. PS - No, I did not have the green blob issue fixed.