Looking for an iPad app that links my iPhone to it.

[Eumatthe]

I have been searching for an app that will display my iPhone screen on my iPad. I have an iPhone 4s and an iPad2. Since my iPhone has 3G I can use it in presentation (connected with the 15pin monitor cable adapter). But in small settings where a monitor isn't readily available and a LCD projector is too cumbersome it would be great to use my iPad to extend my iPhone view.Any suggestion? Free would be great, but paid apps isn't out of the question.ThanksE.M.