Mobile phones are one of the lifelines to current civilization but if you still can not connect to other people because you do not have the luxury of money to make calls, then you're still left out. But thanks to Android, there is already a big solution to your financial problem. Currently, Android offers apps which allow you to make free phone calls to practically anyone. Here are the five best Android apps which allow you to make calls at no cost at all:

1. Guava

Gizmo5 team recently developed the Sipdroid Guava app which enables you to make calls to any US number-for free! Since this app is now acquired by Google, you can synchronize this with Google Voice to be able to make free calls and texts. Using this app, you can also receive calls with your Google Voice number as long as you have Internet connection.

2. Google Voice

Google Voice now has an Android version. This app, which functions real-time, lets you receive voice and text messages the moment they arrive. This is far better than the old version which checks for new messages only once every fifteen minutes. The new version also has an inbox synchronization feature which, when activated, shows messages that are due to come in seconds. But the most amazing feature that you can get from Google Voice is its ability to let you send free text messages and make international calls with your Google number. Take note that the calls here are not free – only the text messages. However, when Guava is synchronized with this app, you can then make free calls.

3. Skype Mobile ^TM on Verizon

The Android version of Skype works quite the same with the iPhone version. Once you sign in, you can see your online contacts. You can make free calls and send messages over a standard 3G or Wi-Fi connection. You can even call your friends right on their PCs using your Skype contact list. Skype's call quality is not at all choppy though there may be times when the connection jumps but over-all, the whole calling experience is satisfying. Interface-wise, Skype is user-friendly.

4. Viber

The Android version of Viber app allows you to call other Viber users for free using a Wi-Fi or 3G connection. Moreover, this app lets you send text messages for free. You can also use this app as your default dialer. Other notable features of Viber are its full call screen and its pop-up text message notifications.

5. Rebtel

Rebtel app comes with a built-in dial pad that does not require you to turn on the app to get things done. You just have to dial right away and you're good to go. This app integrates well with the Android contact manager, allowing you to make free calls to anyone with the same app installed in their devices. Unlike other apps, you can make calls through Rebtel without even using Wi-Fi. This app is compatible with 3G and CDMA connection.

In the coming months or years, there might be other Android apps that will be offering more attractive free call features but as the moment, the apps above are the best to root for. Depending on your needs and interests, you can choose whichever app suits you well.