How to check if my IPhone 4 is turned on?

It was an iPod for a while, but I turned it on. Now what do I do to see if it is? Like set up a number and stuff.

To see if any apple mobile device is on press the home button on the front of the device once, if the screen turns lights up it is on. If the screen does not light up than, it is off. To turn the device on press and hold the button at the top of the device once. To turn the device off press and hold the top button until the screen says slide to power off or something like that. To see if your device is a iPhone instead of a iPod touch look for a icon on your home screen labeled phone if there's a icon labeled phone than you have a iPhone. If you do not find a icon labeled phone than you have a ipod touch

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