So my mom recently got a leftover (new) 07 NAH. How can we tell if she got the newer keys that aren't vulnerable to be scrambled by cell phones?

I dug around on nissanhelp.com for a TSB on the 07 Altima and NAH and surprisingly couldn't find one on this subject.

(I'd imagine that the only ones that could cause scrambling are GSM phones and not CDMA ones.)