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:
Good catch! My thanks to those of you who pointed out that in my instruction on how to contact Skype Customer Service that the blue "Send" button has been replaced with a green Next button, and that to file an e-mail request, we click "Submit."
Online Safety Tip: Do not accept contact invitations from anyone whom you do not know.
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