How hard is an iPhone screen?

I got a new iPhone 4S this morning for my birthday. I have a blackberry and the screen can easily be pushed down and broken but I have been wondering for a while now. How hard do I have to push an iPhone screen before it cracks or brakes?

Not that I want to actually do it, I'm just curious.

What are you planing to do with your phone? Dig diamonds?

IPhones themselves are not that durable. I recommend the Otterbox. And pushing on the screen hard is not really a good idea with any phone

It has gorilla glass which is designed to withstand the test of time without scratching, but it should withstand a bit of weight.

I have seen a guy who was 120kgs stand on a iPhone and it didn't leave a mark…

It is pretty strong, but please, don't take your chances. And get a screen cover and a case. (a screen cover is a sticky plastic sheet that goes on a screen to keep it from breaking)

Very hard