Multiple SID/NID settings
 

I am currently traveling to Albuquerque, NM from Florida, and I was wondering if I can get EV speeds while roaming here? I dialed ##778#, put in my code, and checked my Home SID/Home NID information. Currently, my #1 setting is 544/65535, which is correct. Is there any reason or need to enter an additional SID/NID? It looks like you can enter 20 different settings. So far, I found that SID 79 is for ABQ, but what is the NID setting, and would this even help? I know this is getting deep, but you guys are pretty darn smart on this board! I have Vetvito's ROM installed.
Thanks in advance for any help.