Here is the specification confirmed of the Nokia Lumia 900 4G.
*8MP main camera dual LED flash Auto Focus.
*1MP front camera for video calling.
*4.3 inches AMOLED ClearBlack glass touchscreen.
*Excellent antenna performance.
*4G LTE (limited service areas) or HSPA+ connectivity.
*Windows Phone 7.5 OS 1.4 GHz Qualcomm single-core processor.
*5.6 weight with 5.0 x 2.7 x 0.45 inches display.
*1830mAh lithium-ion battery rated at up to 7 hours of talk time and 300 hours (12.5 days) standby time.
*AT&T's UMTS Tri-band (850/1900/2100 MHz), GSM Quad-band (850/900/1800/1900 MHz), and LTE (700/AWS MHz).
*Customizable Live Tiles on your Start Screen with what you care about - from people to web sites - and they'll continuously scan the web to keep you updated about your world at a glance.
*The latest release of Windows Phone - Version
7.5, codenamed "Mango" - Hundreds of improvements and new features like Multitasking.
*Improved Live Tiles: The Live Tiles on Start dish up more (and quicker) updates on your apps, and they're also a whole lot of fun.
*Speech: you can text, search the web, and lots more, totally hands- (and sometimes eyes-) free. Your phone can even read you an incoming text, and then you can use Speech to dictate and send your reply.
*Local Scout: Find nearby restaurants, shops, and things to do.
*Wireless-N Wi-Fi (802.11b/g/
n) with hotspots support.
*HTML 5 web browser for accessing real web sites.
*Text (SMS) and picture/video (MMS) messaging Access to popular instant messaging services.
*8-megapixel rear camera (2448 x 3264 pixels) with touch-focus, dual LED flash, Carl Zeiss optics, geotagging, 3x zoom HD 720p video recording.
*Multimedia Music player compatible with JPEG, TIFF, PNG, GIF89a, BMP, GIF87a, WBMP, EXIF, WMF.
*Video player compatible with MPEG4, WMV, H.264, H.263, AVI, VC-1, ASF.
*16 GB internal memory and available SkyDrive cloud storage 512 MB of RAM.
*3.5mm headphone jack.
*Facebook, Twitter, Linkedin, email, chat Xbox Live, Office 365, Zune, Bing Maps and Local Scout.
*And realy many more.
*Item model number: 002Z4.
*Dimensions: 2.7 x 0.4 x 5 inches; 5.6 ounces.
*4G LTE-enabled smartphone.
*Windows Phone 7.5.
*4.3-inch AMOLED Display.
*and 1.4 GHz processor.
*Wireless-N Wi-Fi networking (with optional Wi-Fi Mobile Hotspot service).
*8-MP camera with Carl Zeiss Optics; HD 720p camcorder.
*Front-facing video chat camera.
*Bluetooth stereo music.
*Corporate and Personal e-mail.
*released in April, 2012.
What items in purchase?. - Handset, rechargeable battery, wall/USB charger, connectivity cable, SIM tray tool, Product Safety & Warranty Guide, Quick Reference Guide.
Here for more detail: Nokia Lumia 900 4G Windows Phone Review