i don't intend this question as a GSM vs CDMA debate, but rather a GSM vs TDMA debate. I know that at one time Sprint was GSM, and also Bell South Mobility DCS (in my area) was also GSM. Sprint converted to CDMA, i don't know what DCS did, maybe they became part of Cingular and went TDMA? now we have cingular/att converting to GSM. So what was it about TDMA that surpassed GSM into the market place? As I understand GSM it has greater capacity and of course the SIM card makes it much more flexible and TDMA, so if GSM was already here, why not build that out, instead of going to TDMA?