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Continue to ChatLumia Phablet for AT&T on BSIG. To run on Snapdragon 800. Mid-range & low-end Lumias may run on Snapdragon 400, 200. https://nokiapoweruser.com/lumia-phablet-for-att-on-bsig-to-run-on-snapdragon-800-mid-range-low-end-lumias-may-run-on-snapdragon-400-200/