To check the screen resolution of your mobile device simply go to this website:
What Is My Screen Resolution? - www.whatismyscreenresolution.com
Alternatively you can scan the QR code to take you right there:
You must visit that website on your mobile device. You will then see the screen resolution number displayed on the screen. Simply post your mobile phone model and your screen resolution like mine below...
Blackberry Bold 9700 (Portrait)
480 x 360