I have experienced some major issues with my Verizon S3 with a new case on the phone. The case I purchased from Verizon is one that replaces the back cover of the phone and also puts a flap over the screen of the phone. With this case on, I got horrible signal quality from making voice calls. I would drop calls, get lots of broken and choppy calls, and only 1 to 2 bars Max. I found this out after having the phone replaced 3 times and 2 sim cards. After putting my original backing back on , I have had perfect signal since putting on the original. Just in case anyone has had signal issues and had purchased a case, before replacing the phone, try removing the 3rd party case.