Iphone has used to develop the simulator?

I want to learn Iphone development, but did not buy Iphone. Is there any way?
Reply:
Go to the official website under the sdk, comes with support for the simulator.


Reply:
With the official sdk development can use the simulator!
Reply:
Why must use the official ah "?
Reply:
The official sdk, you can use the simulator to debug, but not attached to the real machine, because the certificate, and, even bought a certificate does not support running in the background. The unofficial sdk, not money, not debug in the simulator, but can be used on a real machine.
Reply:
4th floor of your "even bought a certificate does not support running in the background," specifically what is mean?