Microsoft is currently running a promo that allows Lumia 920, 925, and 1020 users to trade-in their phone and get a good $150 discount on the Redmond, Washington-based company'sLumia 950 and 950 XL Windows 10 flagship smartphones.In case you don't know, although the software giant has officially started Windows 10 Mobile roll-out for older devices, the three Lumia's mentioned here are not in the
