Connectivity and Performance
With 1GB of RAM and 8GB of storage, which is expandable up to 128GB via microSD, the Lumia 640 is powered by a 1.2GHz Qualcomm Snapdragon processor. With Windows 8.1 pre-installed and the Lumia Denim update, the device features Outlook, Skype, Cortana and OneDrive. The Lumia 640 comes with a one year subscription to Office 365 Personal. The subscription also includes 1TB of storage on OneDrive and 60 minutes of Skype Worldwide calling per month.