I have an LG Env3 (I doubt the phone model information is important.) I have been going through my settings, and I came across NAM Select. I know very little about it. Although once you change it to the non-normal setting, I believe that you go into roaming mode. Please correct me if I am wrong. Also, I believe that the phone number gets changed. Can you please explain to me in detail what exactly happens when I switch over, and if I should be careful of anything? Thank you for your help.