There are apps which can be used to make free Voice and video calls to other android users over the internet. All you need is a data connection with better speed. 3g or wifi is prefered. Even gprs or edge network can be used for voice calling but there will be some lag.
In the market you can find many apps like Tango, Viber, Line for making free calls. Here we are comparing the features of these apps.
Tango
Tango is having features like voice and video calling. It's very easy to create your account, all you need is your mobile no. and email id.Tango also supports iphone and PC. So that you can call to android,iphone and PC users who are having tango account.
Viber
Viber is having voice calling and instant messaging function. You can send pictures using the messenger. Creating account in Viber is easier than Tango, you just need to give your phone no. It allows you to switch to GSM during the call.
Line
Line is another app.It's similar to Viber but some additional features are there.It include group messaging with up to 100 contacts.But the downside is that it will eat 8MB of your memory remember Viber requires only 4MB space.
So if you are having a data connection with better speed then Tango will be suitable for you.But if you are still using 2g then Viber will satisfy your needs.
