29-07-2013 19:37 - edited 30-07-2013 19:04
The availability and compatibility of the applications depend on the discretion of their publisher. In this case, I suggest contacting the publishers of Skype and Gtalk to confirm if there will be a version that will be compatible for your Asha 501.
Google Talk /Hangout : http://www.google.com/intl/en/contact/
Hope this helps.