Global setting and GSM Roaming

[zachavm]

I know that the Sprint TP2 can't yet work on US-GSM networks through their sim cards. However, I was wondering if it will roam in the US to GSM towers. I ask this because I just changed my setting to CDMA only and it seemed to fix a problem I was having with the phone not working after coming out of Flight Mode. Is there any benefit to have the phone in "global" setting and not CDMA when here in the US?