How to know mobile model?

To know the model number of your nokia phone, all you have to do is open the back cover and remove the battery. There you can see its model number since some nokie phones have its model names posted near the sim card slot. It you can't find it there, I suggest you post the picture of your phone here or at any site which you can ask people if they can recognize your model name. You can upload it here, try it. :)