Why is the iPod touch thinner than the iPhone?

Why is the iPod touch thinner than the iPhone?

A plain iPod doesn't have the hardware necessary to make it a telephone, so not as much space is needed.

To accommodate more hardware

The ipod does less.

Just because.

Cause it doesn't need certain components that the iPhone needs to be a phone in the 1st place, therefore it can be & is thinner.