bianca is correct about the phone. a few days ago, i saw on a site (i forgot the site though...) a screenshot that showed a picture of the pokenav and what the phone on it does. it works WAY differently then the on in GSC. in Emerald, the person is transported to your current location! believe me if you want, but it doesn't matter to me because i know that i am telling the truth. if you want, you could search on yahoo or google or whatever, but I know i am correct.
sorry for double posting, but the system won't let me edit my posts because i am a new member...o well. anyway, i found the site. here it is.
*link removed*
just copy and paste the address above, and you will find out info on the phone for the pokenav (including a screenshot), as well as info on some other emerald stuff. enjoy.