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What makes Microsoft Lumia 640 XL LTE Dual SIM unique?

Here are 4 unique features & highlights of Microsoft Lumia 640 XL LTE Dual SIM :
1 The best1 Windows phone with 13 MP Camera
2 The #2 most popular2 Windows Phablet
3 The #3 phone with Quad-Core processor and 1 GB RAM
4 The #3 most popular Windows Dual SIM phone
1 based on 91score
2 based on no. of views on 91mobiles