The Good thing about Android is that there is so many apps offering you to make free international calls. By just using 3G or Wi-Fi you can make free calls from your Android device
Very old and popular service offering free HD voice quality calls and messaging on various mobile platform. You can import friends from popular networks (Yahoo!™, MSN® Messenger, AIM®, GoogleTalk, Facebook©, ICQ, MySpace, Hyves) and make free calls once they’re on Nimbuzz. With Nimbuzz you can send free texts, free video, photo and music sharing between your Nimbuzz friends. It’s also available on the desktop so you can call people over your laptop.
Viber is a free app which allows free international calls and text messages to other viber users using 3G or Wi-Fi. The sound quality is much better than a regular call. Calls are free as long as they are made to other Viber users and these is included cross platform support means you can call free to your iPhone friends who have Viber on their phone.
Fring allowing users to make fee calls, video call and Group Video calls. Most promising feature in Fing is that it provide Group video calls. Now 4 people can video call at the same time. It support video calls on 3G, 4G and Wifi. Its DVQ (Dynamic Video Quality) technology offers you the best video and audio quality possible by automatically and continuously adjusting your video call quality to match your connectivity.
This is a popular application which is available in the market to make video and voice calls. You make free Skype-to-Skype video calls, and call phones or landlines at Skype rates on the move. You can make calls through Skype over 3G or WiFi.
Qik is a product from Skype offer video chat, video mail and video share. With Qik, not only you can make free video calls but you can broadcast videos live as well as drop in on video feeds of your friends. You can also sharelive videos to Facebook, Twitter and more. It support video calls on 3G, 4G and Wifi.
Tango allows you to make free phone calls and free video calls over 3G, 4G, and Wi-Fi. Make calls to any other person who has Tango installed on their phone or tablet. Start a Tango call with just voice, and easily move into a video call when you have something to share. It’s easy to use, it’s fun, and it works. You can also make free calls between Android and iOS users.
You can use the Mobyler worldwide to make FREE calls as long as your friends and family have also installed the Mobyler application. You can also use Mobyler for making phone calls to other mobiles (who have not installed Mobyler) using the credit (buying the credit). Mobyler offers cheap international calls.
8. Tru App
Truephone lets you make free call to toher app like Skype, Gtalk users over Wi-Fi. You can also call any phone number around the world, both landlines and mobile from just 1.3p/2.1c a minute.
9. Google Voice
Last but least Google Voice allow user to make cheap international call with your Google number. With Google voice you can also send free text messages, place calls, listen to voicemail and read transcripts. But this app only available in US.
10. Yahoo Messenger
With Yahoo messenger, you can make free Voice and Video calls, chat with Facebook friends, free international SMS and Share photos and video.
You need to install the Latest Yahoo Messenger Voice and Video Plug-in to enable the call features. Download the Plug-in here.