The PRL isn't for specific states. The latest one is 3025 which mostly everyone uses to get 3G or better data service. The signal all depends where you are, the one every phone comes with is the Cdma auto prl. you can always dial *#*#4646#*#*# and you can change it from there(cdma auto prl to cdma only.) Prl helps you get better data, the latest one helps with getting 3G and better data but im not totally sure if it involves the signal, I mostly have 3G and my signal is 4 bars, but when i go home i get 0 bars and 1x so i decide to put cdma only and i get the 3 bars and 1x.