WiFi Bingo Caller is an iPad version of Bingo. It provides a "board" so you can visually see every number that's been called. You have complete control over the game by being able to "call" numbers randomly or manually. You can even "uncall" numbers.
Its main purpose is to be paired with up to 12 "Wifi Bingo Card" iPhone apps. Each number, whether called, or uncalled, is sent to the connected "card". Each card's numbers (and markers) are represented on the Caller app.
However, there is no tactical advantage to using either app. They simply communicate with each other and make it more fun to play BINGO.