VOIP (Voice Over Internet Protocol) based internet calling services are pretty popular these days with mobile internet reaching pretty good speeds with 3G and 4G LTE. The best feature of VOIP and video chats is that they are free or relatively cheaper if you are calling from mobile to mobile and you have to pay only for the Internet. While these services were available initially on PC, now they are available on most smartphones.
There are many VOIP based apps in the Windows Phone store offering you variety of features. If you have an Windows phone with front-facing cameras and looking to make video calls or voice chat, then there are a lot of great options.
Here are some of the best VoIP applications that are available in the Windows Phone Store.
1. Skype:
Skype is the most popular VOIP and video calling service available across multiple platforms and undoubtedly the leader here. You can make free voice and video calls to anyone else on Skype, whether they’re on an Android, iPhone, Mac or PC, as well as IMs to your friends and family, no matter where they are. Skype to Skype IMs, video and voice calls are free over 3G or WiFi.

2. Rebtel:
Rebtel allows you to connect with 17 million people around the world and make low-cost international calls with Rebtel for rates up to 98% lower than your regular operator’s. The Rebtel app connects your calls with local numbers and uses your wireless plan minutes instead of your data plan, letting you enjoy talking to your loved ones and not worrying about you being disconnected because of a spotty data connection.

3. Tango:
Tango is yet another popular app for video and voice calling from Windows phones. With Tango, you can make free Video Calls, free Voice Calls, send free Text Messages, and send free Video Messages and Pictures. The only problem with Tango calls is that it is not yet compatible with Windows Phone 8, so will not work with Lumia 920 or HTC 8X.

4. KakaoTalk:
Kakao Talk is one of the most popular smartphone messenger for free calls and text. akaoTalk uses WIFI or your existing data plan (3G) to let you send and receive unlimited texts, photos, videos and audios to other KakaoTalk users for free. Create groups on the go, invite as many friends as you want and chat all together at once. Unlike other apps, KakaoTalk has no limit to how many people you can invite in a group chat.

5. MobileVoip:
MobileVoip lets you make cheap calls to national or international destinations. MobileVoip offers free 3G or WiFi calls for Windows Phone, Android, Symbian, BlackBerry and iPhone users. Simply install MobileVoip, register with one of the many supported VoIP brands and make FREE calls to your friends and family abroad. If your selected destination is not among the FREE destinations, MobileVoip calls are still very cheap.

