Most of my friend use andriod mobile and they all have little complain about their hang problem. if more than 2 apps opened in background the mobile hangs up. after that the battery need to remove and insert it again for work properly like before. so I purchased windows mobile microsoft 640. there is good sound quality and the ease of use is best. the style and design is just formal and thin having good shape. suitable price range and best feature is its offline map. GPS can be used without any data connection it also keep records of 24 hours movement. battery with 2000mAh. consumer durability product and value for money. you can buy it.