So many people asked me this, I thought I’d rather make a post out of it. BlackBerry just released five different handsets this week and Bold 9900 and Bold 9930 are two of them. While it is a valid question, the answer is very simple. BlackBerry Bold 9900 and BlackBerry 9930 are exactly identical in features and hardware except only one difference. BlackBerry Bold 9900 is a GSM phone that operates on GSM 850 / 900 / 1800 / 1900 networks while BlackBerry Bold 9930 also supports CDMA. Bold 9930 works on CDMA 800/1900 networks in addition to the GSM 850/900/1800/1900. In simple words for example in US, BlackBerry Bold 9930 will work on Verizon and Sprint Nextel while 9900 will work on rest of the networks.
Yes 9930 works on both GSM and CDMA, so if you want to switch back and forth from CDMA to GSM and back, it’s better to grab 9930.