I successfully fixed the weak Wifi signal I was having on my Note 2 by turning of the "Wifi Power Save Mode". So far I am getting better wifi signal throughout my house. (*#0011#, Menu, Wifi) Granted, it's not a huge improvement but it's noticeable.
So that got me wondering: Is there anything similar that I can adjust to increase the cellular/data signal? Since my upgrade from the LG Optimus V (Virgin Mobile) to the Note 2, I've been losing all signal more frequently. Supposedly the Note 2 is a very powerful and advanced piece of equipment (or so it seems), so I find it hard to believe that it's anything more than a software configuration problem.