Vopium

Vopium allows you to make international calls or send SMS from your mobile phone without changing your current operator or SIM-card.

Vopium claims to save 50-90% on international calls and text messages from your home country - without changing your current operator or SIM. Using app you can chat for free with your friends on MSN, Skype, Gtalk, Yahoo, AIM and ICQ.

At the beginning you will be given 15 free min + 15 free SMS to try it out.

Dial like you are used to. No Wi-Fi needed. Great voice quality.

You pay your operator for a local call and Vopium for the low cost international call.
You can download at: http://apk.cuaban.net/detail/7487/ Vopium .html