myDialBox for iPhone - myDialBox allows you to make phone calls worldwide with reasonable pricing plans. You receive $1 balance as a free gift to start.
myDialBox supports WiFi, 3G, and EDGE connections so you can call your family and friends from anywhere
Talk Out Mobile VoIP for iPhone - Call and video chat with your Talk Out Mobile friends for free. Make cheap local or international calls to non-members
Directory for Face Time - This app is a Face Time user directory which provides you with free, high-quality mobile voice and video calls over 3G and WiFi. Directory for Face Time is ideal for meeting and communicating with new people worldwide. It's very easy to use, has lots of active user IDs, and works very well
Firetalk - allows you to make free calls to USA, Canada and UK, and cheap calls to lots of destinations around the world. New users will receive a $1 dollar credit, to call worldwide.
Firetalk lets you make & receive calls and message other Firetalk users for free
goober VoIP - allows you to make cheap international calls to mobile phones and landlines. For 40 countries, the first two minutes of every conversation are free. After the call, the cost for those two minutes will be credited to your account.
For more savings, you can use flatrates
Messagey - allows you to send free text messages to US/Canadian cell phones, anytime, anywhere.
One of the app's unique features is Walk 'n' SMS, which allows you to use the iPhone's camera to see where you are going, so you can walk and text at the same time.
Messagey enables you to customize each contact with their own background and their own sounds
VidyoMobile - delivers up to full HD business grade point-to-point and multipoint video conferencing to your iPhone, iPod or iPad device when connected to your enterprise or service provider's Vidyo infrastructure.
Experience telepresence quality conferencing with shared content viewing on the move with VidyoMobile
Cisco Unified Mobile Communicator - Cisco Mobile complements your iPhone by providing mobile access to your office phone system. No matter where you are, you can use Cisco Mobile to join meetings, answer business calls, and listen to your work voice messages
