I really like Tango, because you can use it to make video calls between Android and iOS devices. You can use either wifi or the cell network. Before, when I tested, the devices didn't have to have the program already started to receive a call, which is nice. The only problem is that Tango isn't working on the Infuse, yet. The person who you are talking to see's your video sideways. Also, the video likes to zoom way in, so that they only see a closeup of a small portion of your face. The Tango engineers say it's a known issue and they are working hard to find a solution. It seems to be happening on a lot of Samsung phones. I'm looking forward to them getting this fixed. Tango is a good one to use.