I have an S3. Disappointed in reception compared previously with Motorola Droid.
Any reports about improvements in S4?

I bought the Galaxy Nexus when it first came out. I love the stock android and the features of the phone. However, I have replaced it five times under the warranty. It continuously has GPS and 4G connectivity problems (despite being in a strong 4G area). I now have the option of swapping it again, or swapping for a Motorola RAZR HD (not the MAXX version). Should I swap out for the RAZR HD or stick with my Galaxy Nexus? I love stock and do not want to root, but would likely replace launcher if possible to mimic stock. For me, call quality is important and I do not care about the camera. Web browsing is important too as well as syncing with Exchange email. Thoughts?