Because there is a share of QCOM on every CDMA device made by a manufacturer. The carrier has to share with manufacturer. US is the strongest CDMA market in the world with manufacturers abiding to highest quality standards. Other CDMA markets are dominated by Mediatek processors. A chipset architecture many ways inferior to Qualcomm's proprietary Snapdragon family. Also, MTK handsets are regarded as devices for the masses. Even as CDMA technology in India remains on top, people buying off counter are least bothered about the drawbacks of GSM and continue to buy Gionee, Micromax, Lava, Spice and companies I wouldn't know of. Almost all dual sim handsets carry MTK processor, MTK means no performance. You need to flash MTK flasher for upgrading or downgrading a firmware on Indian HTC, China Telecom Samsung handsets. So all those who wouldn't compromise on quality purchases a North American CDMA handset.
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