A big & good quality screen, stylish OS and premium build are all sprinkled into Nokia Lumia’s magic in a package that is made to impress. There are many starry features which I have enlisted for you if you are Nokia Crazy Fan in that case handset is enabled to match your needs. And still never let you feel low in front BlackBerry’s, Samsung’s and Apple’s.
Key features to talk about are as follows:-
· Quad-band GSM/GPRS/EDGE support
· Quad-band 3G with 42 Mbps HSDPA and 5.7 Mbps HSUPA support
· 4.3″ 16M-colour AMOLED capacitive touchscreen of 480 x 800 pixel resolution
· Scratch resistant Gorilla glass display with anti-glare polarizer
· 8 megapixel autofocus camera with dual LED flash, 720p@27fps video recording and fast f/2.2 lens
· 1MP front camera
· Windows Phone 7.5 OS (Mango), upgrade-able to WP 7.8
· 1.4GHz Scorpion CPU, Adreno 205 GPU, Qualcomm MSM8255 chipset, 512MB of RAM
· Wi-Fi 802.11 b/g/n
· Non-painted Polycarbonate body
· GPS receiver with A-GPS support and lifetime free voice-guided navigation
· Digital compass
· 16GB of on-board storage
· Active noise Cancellation with MIC
· Built-in accelerometer and proximity sensor
· Standard 3.5 mm audio jack; FM Radio
· MicroUSB port
· Bluetooth v2.1 with A2DP and EDR
Now I am going to Enlist which made slipped from Top in Popular Charts so here are the Main disadvantages for which you want to give this phone a Miss:-
· You are missing Windows Phone 8
· No USB mass storage (Only file management and sync) 
· No Video calls
· Non-Replaceable battery
· No memory card slot
· MicroSIM card slot
· No native DivX/XviD support
But I don’t close the Post on Lumia 900 here with shortfalls. Windows Phone experience is impressive despite a Single-core chipset, the OS is simple, sober and Social. Proprietary apps are a as usual good too – Nokia Reading is recently added to the familiar Drive, Maps and Music.