Microsoft Lumia 640 Dual SIM

The Microsoft Lumia 640 Dual SIM is a mid-range smartphone that was released in March 2015. It runs on the Microsoft Windows Phone 8.1 operating system, which is upgradable to Microsoft Windows 10. The device is powered by a quad-core 1.2 GHz Cortex-A7 processor and Qualcomm MSM8926 Snapdragon 400 chipset, along with Adreno 305 GPU. It comes with 8 GB of internal storage and 1 GB of RAM, with the option to expand storage up to 256 GB using a microSD card.

The Lumia 640 Dual SIM features a 5-inch IPS LCD display with a resolution of 720 x 1280 pixels and Corning Gorilla Glass 3 protection. It has a pixel density of 294 PPI and a screen-to-body ratio of 67.6%. The phone also includes a main 8 MP camera with LED flash and the ability to record 1080p videos, as well as a 1 MP selfie camera capable of recording 720p videos.

In terms of connectivity, the Lumia 640 Dual SIM supports Wi-Fi, Bluetooth 4.0, GPS, and FM radio. It has dual SIM card slots and is compatible with GSM and HSPA networks. The device also includes sensors such as an accelerometer, proximity sensor, and compass. The phone is available in glossy cyan, orange, white, and matte black colors.

Overall, the Microsoft Lumia 640 Dual SIM offers a decent set of features for its price point. It has a solid build quality, a good display, and a capable camera. The expandable storage and dual SIM functionality are also convenient for users who need extra space or want to separate work and personal lines.

However, some drawbacks of the Lumia 640 Dual SIM include its outdated operating system and limited internal storage. The phone may also struggle with heavy multitasking or demanding apps due to its lower-end processor and RAM. Additionally, the 1 MP front camera may not be sufficient for users who prioritize selfies or video calls.