Iphone 4, software 5.1.1, fake call

Well if someone could help me, i saw an application on my friends iphone, it works like this, he can call person, call it B, person B, and it would hide his number and that person would see any number he choose. Does anyone know what app is that? Working in Europe!

Hideapp

No idea about that app. But best solution is that delete that application.

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