Screwdriver needed to unscrew Iphone screws?

I'm not talking about the ones on the bottom, I used a knife for them.
I'm talking about the ones in which I'm repairing the screen.
Like I have the ones that came with the new screen, but they are too big and won't unscrew anything.
Does anyone know what type I'll need to unscrew all the screws in the Iphone?

A smaller one

It depends on the model of phone. On the 4 and more recent, you usually need what is called a "torx" driver or bit.

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