Papaya - turns your phonebook into a fun and useful social network! It allows you to communicate with your friends cheaply and easily, no matter where you are. Using Papaya, you can play games with your friends, chat with them over IM, share pictures and other files, make cheap international calls, and more
Vyke Mobile If you’re looking to save money on your international calls and text messages then Vyke Mobile is for you. We have both Using your phone’s WiFi connection to carry your conversations and messages via the internet you can save bundle when compared to your regular mobile operator
Google Voice - US Only Access your Google Voice account right from your iPhone.
Receive push notifications for new text or voicemail messages.
Send free text messages to U.S. numbers and make international calls at cheap rates.
Listen to your voicemail, read transcripts and manage your Google Voice inbox.
Display your Google Voice number as caller ID when making calls
Mobii (Java) - All-in-one application that brings Internet, VOIP, Social Networking, Entertainment, Instant Messaging, News, RSS and more to your phone!
Cheap International Call
It's time to say goodbye to expensive international calling cards and punching in annoying serial numbers
Nimbuzz Mobile is the best free* mobile messenger that lets you call, chat, message, and send files on the go, for free. It combines all your buddies from Skype, MSN/ Windows Live Messenger, Yahoo! Messenger, ICQ, AIM, Google Talk, Gadu-Gadu, Hyves, and more. One login, one contact list, all accounts
Nimbuzz v1.9.5 fullscreen - Hello friends .... Nimbuzz Messenger combines the power of internet and smart phone messenger into one, and lets you make free video calls, voice calls, send messeges, group chat etc enjoy and its work also in multipletask ..
Webuzz is a mobile messaging application compatible with three of the most popular networks: MSN Messenger, Yahoo! Messenger and Google Talk.
One of the salient features of the application is that it incorporates a translation system, which lets you send messages in different languages (English, Arabic, French, Spanish, Indonesian and Portuguese)