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The ZTE BAVO H110 supports ONLY CDMA2000 1xEVDO NOT CDMA2000 1xRTT. Recall that CDMA2000 1xRTT, the core CDMA2000 wireless air interface standard, utilizes the same RF bandwidth as CDMA-One (IS-95) and utilizes a duplex pair of 1.25MHz radio channels without separate data/voice channels. This has been an issue for some of our U.S customers who were in a geographic region that did not have 1xEVDO and only had 1xRTT. 1xRTT is also called 1x or IS-2000 or simply CDMA2000.