Skype is a very mature audio- and video-chat client for iOS devices. If you don't have a video camera, you can use it to talk to another Skype user for free. I've used it because Apple's own FaceTime didn't originally support video chats without a WiFi connection (and still won't in many configurations of phone and carrier ). Quality of the video is pretty remarkable, and fairly robust. I've once had a two-hour video chat with a friend while driving down the highway with the camera pointed out the windshield so they could watch my progress from 3,000 miles away, and we only lost the connection twice.
At least as important, Skype is cross-platform. You can text-, audio- and video-chat with users on other mobile platforms, desktop computers, and even embedded systems some televisions.
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