4G and Call Signal Strength

sorry for your troubles. my gs3 gets almost as good signal as my razr maxx and rezound. in some areas, the gs3 signal is better than razr maxx. perhaps you have a defective phone. which software version are you running?
 
I assume I am on the latest. I actually did a factory reset recently and that solved a few issues I personally was having. It's not a big deal to me but I can see how some people consider it a big deal.