Skype is not working for my GT B7722. Kindly send url and installation procedure.
The phone model you mentioned and as according to its specs is not an Android phone at first place.
Skype is available for following mobile platforms - iOS,Android,Windows Phone and BlackBerry.
Have a look at this link: https://support.skype.com/en/faq/FA10653/how-do-i-get-skype-on-my-android-device
Uninstall any version of Skype currently on your phone and reinstall from Google Play (https://play.google.com/store/apps/details?id=com.skype.raider).