This phone will only work with 2G: GSM 850\/900\/1800\/1900MHz 3G: WCDMA 850\/2100MHzIt's unlocked for worldwide use， customers please take a check to see if your local area network or the communication operator you are using is compatible with this phone before purchase. You can also go to this topic [===Official Help Center=== How To Check If This Phone Can Be Used In Your Country] to find how to confirm this.<br>  <br> For the long time waiting Doogee dg550 get it's update into Android 4.4 finally ! For the firmware you guys can refer to its official release:<br> http:\/\/www.doogee.cc\/servicexiazai_detail\/newsId=40.html  <br> Here is a Video from doogee official to teach you how to update to Kitkat 4.4. <br> But for the pre-installed Android 4.4 version will be available later as doogee has only part of them in stock now. We will modify our parameter when get the whole stock changed into Android 4.4. Hope you can understand!<br>  Dear customers，  Any new information will be announced at our forum，please refer to  ===Official News===DOOGEE DAGGER DG550 News Update  <br>Description: <br>DOOGEE DAGGER DG550 5.5-inch MTK6592 1.7Ghz Octa-core Smartphone.It built in 1280*720 pixels HD OGS IPS capacitive multi-touch screen. It is powered by MTK6592 Octa-core 1.7GHz CPU， 1G RAM and 16GB ROM to ensure its running more stably. The 3G band is WCDMA 850\/2100MHz，  It supports dual SIM card dual standby， WiFi， wireless Bluetooth and 3G for data transmission and hands-free calling. Its built-in front camera is 5.0MP， and the back 13.0MP with flashlight. It also supports multi-language.  <br>          Basic Information           Model       DOOGEE DAGGER DG550           Band       2G: GSM 850\/900\/1800\/1900MHz    3G: WCDMA 850\/2100MHz           Sim Card       Dual SIM Card Dual Standby           Style       Bar           Color       Black，White           Shell Material       Plastic                       System           OS       Android 4.2.9 (It will change into Android 4.4 later and this Android 4.2.9 can be updated into Android 4.4 by yourself，too )           CPU       MTK6592 Cortex A7 1.7Ghz Octa-core           ROM       16GB           RAM       1GB                       Screen           Display Size       5.5 Inch           Type       OGS IPS screen           Resolution       HD， 1280 x 720 pixels           Touch Lens       G+G 10 Points capacitance screen                       Support Format           Ringtones Type       Polyphonic\/MP3           Audio File Format       MP3\/WAV\/AMR\/AWB           Video File Format       RMVB\/3GP\/MPEG-4\/AVI           Image File Format       JPEG\/BMP\/GIF\/PNG           E-book Format       TXT\/CHM\/DOC\/HTML           FM Radio       Yes           Earphone Port       3.5mm           Card Extend       Support TF card up to 32 GB extended                       Data