Android users can rejoice. Rebtel, an Android app, lets them make international Android-to-Android calls for free.
This tool, which I came across on TechCrunch, looks to be a promising one. Based on Skype’s concept, it lets Android users save a significant amount on all kinds of calls. And for international Android-to-Android calls – though some local call charges might be applicable – the international call rates won’t be charged.
More than 50 countries are included…and you don’t need Wi-Fi to make the calls. You could do it using the same cellular network.