It hasn’t been very long since Microsoft took over Nokia’s smartphone division, but the software giant hasn’t been standing still. Two of the latest devices to launch are the Microsoft Lumia 640 and Microsoft Lumia 640 XL. Four versions of each will be produced – single-SIM 3G, single-SIM LTE, dual-SIM 3G and dual-SIM LTE – but availability will depend on regions and carriers. We...