Verizon and Sprint use CMDA wireless technology. Sony Ericsson specializes in GSM/WCDMA wireless technology, that is used in most of the rest of the world as well as by AT&T (Cngular) and T-mobile. They use to make a few phones for CDMA but they weren't popular and Sony Ericsson left that business. Virgin and AMP'd use the CDMA networks of Verizona and Soprint and don't own their own network.
why doesnt sony ericcson make any phones for companies like sprint,verizon,ampd,and virgin mobile?