I have the S3 and have the worst signal and so many dropped calls I am just about fed up, my husband has the IPhone4 and has no problems. I also have the network extender and that makes the dropped calls worse. I have had many other problems with this phone and ended up with three replacements and I bought the phone brand new and all I get is used certified replacments that tells me someone else returned theirs because of problems and they tell me they can't send a new phone. I feel like as much as I spend on my bill I should get a better signal and a better phone all together. I have been with Verizon for over 10 years and I think that maybe it is time to move on to another cell phone company