Microsoft
Microsoft Lumia 640 XL Dual SIM
Microsoft
Microsoft Lumia 532 Dual SIM

Microsoft
Microsoft Lumia 640 4G LTE

Features
Microsoft Windows Phone 8.1 with Lumia Denim, Yes, Yes, Qualcomm Snapdragon 400 Quad-core 1.2 GHz Cortex-A7, Yes, Yes, SMS (threaded view), MMS, Email, Push Email, IM
Microsoft Windows Phone 8.1, Yes, Yes, Qualcomm Snapdragon 200 Quad-core 1.2 GHz Cortex-A7, Yes, Yes, SMS (threaded view), MMS, Email, Push Email, IM
Microsoft Windows Phone 8.1 with Lumia Denim, Yes, Yes, Qualcomm Snapdragon 400 Quad-core 1.2 GHz Cortex-A7, Yes, Yes, SMS (threaded view), MMS, Email, Push Email, IM
Memory
MicroSD, up to 128GB, 1 GB RAM, 8 GB storage
MicroSD, up to 128GB, 8 GB storage, 1 GB RAM
MicroSD, up to 128GB, 8 GB storage, 1 GB RAM
Display
IPS LCD capacitive touchscreen, 720 x 1280 pixels (~259 ppi pixel density), 5.7 inches (~69.1% screen-to-body ratio), 16 M colors
Capacitive touchscreen, 480 x 800 pixels (~233 ppi pixel density), 4.0 inches (~58.5% screen-to-body ratio), 16 M colors
IPS LCD capacitive touchscreen, 720 x 1280 pixels (~294 ppi pixel density), 5.0 inches (~67.6% screen-to-body ratio), 16 M colors