There are no official announcements on the technical specification of the Nokia C7. So the specifications given here are unofficial preliminary specifications.
Nokia C7 is a 3G phone with HSDPA. So the phone is GSM and can be used anywhere in the world. The phone has a 3.5″ AMOLED resistive touch screen with a resolution of 360×640 pixels and capable of displaying 16M colors. There are accelerometer and proximity sensors in the device for auto display rotation and auto turn off of the display respectively.
A 3.5mm audio output jack is provided enabling you to plug in any of your favorite ear pieces to enjoy the music. To store all your favorite music on the phone, there is an inbuilt 8GB of memory. And if this is not enough for your, there is also a microSD card slot to which you can plug in a microSD card of up to 32 GB. The device is also fast in processing with a 256 MB of RAM.
GPRS, EDGE and HSDPA are the cellular data options available on the device. Other connectivity options include Wi-Fi 802.11 b/g/n, Bluetooth v3.0 with A2DP and a microUSB v2.0 for PC connectivity. An 8 MP camera gives you a good image clarity can can be used to snap photos and videos. Dual LED flash, autofocus are other options available in the camera section. There is a secondary front facing camera for video calling functions.
The device runs on an ARM 11 680 MHz processor and supports full HTML web browsing and RSS feeds. The integrated A-GPS makes navigation also possible. A standard Li-ion 1200 mAh battery is provided with the phone.
how can we use the video call. .what application in c7 can be use video calls
The video call is used only on the 3G network. When you find yourself on a 3G network, your C7 will indicate that you are on 3G. Only then can you make a video call. Doing that is simple. You just dial and call a number, then instead of voice call you select video call, and you are on. The person you are calling should have a 3G enabled phone so as to see your image.