1. WhatsApp Messenger

WhatsApp Messenger is a cross-platform mobile messaging program that allows you to send and receive messages without a phone number or email. It is available on iOS, Android, Blackberry, Nokia S40, and Nokia Symbian. Simply download the app from the Play Store, and you can start chatting with friends and family right away. WhatsApp Messenger allows you to send text, images, and voice messages to anyone in your phone's address book, with an unlimited number of messages. If you're looking for a simple way to message friends and family from your phone, WhatsApp Messenger is a great app.

2. Skype

Skype is a video chat and voice call software that enables users to talk to one another, using a broadband Internet connection, for free. The video chat offers a more personal experience and allows you to see and talk to your friends and family just as if you were in the same room. Skype also offers video messaging, which allows you to save a video message to be sent to someone when they are not available to chat.

3. Talkatone

Talkatone is a free VoIP (Voice over Internet Protocol) phone app that allows you to make and receive phone calls from your Android or iOS device over WiFi or 3G/4G. Talkatone offers a number of features that allow you to customize your experience, including the ability to create a custom voicemail message, schedule a call to call back later, and send a text message to your voicemail.

4. Voxer

Voxer is a free instant messaging and walkie-talkie app that lets you send messages, photos, and videos to friends and family. Voxer is available on iOS, Android, and Windows Phone 7.

5. Skype Lite

Skype Lite is a free, very lightweight version of Skype that allows you to send messages, photos, and make voice or video calls. Skype Lite is available on Android and is the ideal app if you're looking for an app that works well on low-end devices.