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The CDMA carriers offer a few models of "World Phones" which have SIM card slots for the installation of GSM SIM cards so these phones can operate on GSM networks. These phones require a second radio, so cost more to manufacturer. One example of such a World Phone is the [[BlackBerry Bold 9650]]. Currently (2012), there are no Verizon 4G LTE models that offer GSM support. The world phones are 3G phones when operated domestically. == Other Technologies and Related Termonology ===== WiMax ===Sprint Nextel developed WiMax technology before Verizon's 4G LTE was available. WiMax is a high speed alternative to 4G LTE. However, Sprint Nextel has decided to abandoned WiMax and convert their networks to 4G LTE. (May 2012)=== 4G LTE ===CDMA 3G is being replaced / upgraded to 4G LTE, a faster data technology. Unlike CDMA 3G (called 3G EV-DO), 4G LTE is supposed to become a global standard, which includes Europe and regions previously not 3G EV-DO compatible. Even though 4G LTE will eventually be more universal, carriers such as Verizon are still using incompatible radio frequencies which Europe. As of 2012, Verizon 4G devices are not world roam compatible.AT&T and Verizon are each using 700 MHz to build their LTE networks. But they use different slivers of this frequency, and because the "bands" aren't harmonized, the specifications are different and devices built for AT&T won't work on Verizon's network and vice versa.=== 3G EV-DO ===In North America, Verizon and Sprint have large network coverage for 3G EV-DO data technology.