Hi, Ershadismail, and welcome to the Community,
Skype has not made any announcements about plans to release versions of the Skype app for older BlackBerry OS devices (OS 7 or 6). Skype is now available on the BlackBerry Z10 and Q10 devices running the 10.1 OS update.
For more information, please see these FAQ's:
Please note: To remove (delete) a Skype Account, you must contact Skype Customer Service directly. We here in the Community cannot process account-related service requests.
Online Safety Tips: Do not accept contact invitations from anyone whom you do not know, and change your passwords regularly and often.
Do you have a Skype trick up your sleeve? Share your Solutions and Tips with us!