Skype finally has a full fledge android app, make calls over 3g or wifi. The app requires android 2.1 and above.

 

FEATURES:

Skype-to-Skype calls : It's free to call each other if you all have Skype.

Instant messages (IM): Instant message one or more people at the same time for free.

Call mobiles and landlines: Great value calls to people who aren't available on Skype.

Find friends: Easily find your friends and add them to your contact list.

Call forwarding: Forward your Skype calls to any phone you choose when you’re not online.

Import contacts: Copy your contacts over to your Skype contact list.

Online Numbers: One number anyone can call you on and you answer in Skype.

Voicemail: Let voicemail take a message if you miss a call on Skype.

Caller ID