The critical difference is the latter pair are equipped with GSM (Global System for Mobile Communications) cellular radios only, meaning that they will work with networks like Rogers Wireless in Canada and AT&T in the United States.
There are advantages to either technology, but because a larger portion of the world uses GSM, Research in Motion -- the company that makes BlackBerry devices -- is more motivated to focus their efforts on creating GSM cell phones.
GSM Arena (gsmarena.com): While this site won't be quite as useful for people interested in CDMA-based providers like Sprint and Verizon, GSM Arena is fantastic for just about every GSM mobile phone on the market.
Other brands in Europe that are either affiliated or partnered with Vodafone are Swisscom (Switzerland), Telsim (Turkey), Proximus (Belgium), SFT (France), and Plus GSM (Poland), among others.
This may or may not come to pass and even if the Curve launches with Verizon, it will not be identical to the version sold by AT&T, simply because of the difference between CDMA and GSM.
A good resource to check when confirming what version of Bluetooth your cell phone is compatible with is GSM Arena, a website that has the basic specifications for most GSM phones.
Motorola Q: Up until now, this super slim smartphone has only been available to CDMA operators]], but later this year, Motorola will be releasing a GSM version of the MOTO Q.
In terms of wireless connectivity, the T-Mobile G1 gets loaded with quad-bad GSM, high-speed 3G (up to 7.2Mbps), 802.11b/g Wi-Fi, Bluetooth 2.0, and a built-in GPS receiver.
Some of the newest cell phones on the market do meet GSM standards, but most older models, even those that are just a year or two old probably are not compatible with GSM.
It is sold as a generic product through a Chinese manufacturer and distributor, offering quad-band GSM connectivity, on-demand GPS data, and a range of parental controls.