My iPhone 4 crashed, What do I do?

My iPhone 4 (Verizon) crashed, while I was using google voice (over "phone" app) it went black and vibrated (pulse style) for about 5 minutes, now it doesn't do anything. I've tried hitting every combination of buttons I could think of, tried calling it, tried locating with icloud, the phone is completely unresponsive to anything. I tried plugging it into my computer that did nothing as well.

I'm thinking the battery once the battery has completly died I can try re-charging it, however I currently have no way of knowing when its actually dead.

Any tips or tricks I should know about?

thank you in advance.

Added (1). Nick (2nd Answer) - wow Nick, I was going to elaborate a little more how my iphone was completely unresponsive but I figured I'd better give it another try before responding.

I did the soft reset (which I tried many times before your answer) and it powered up fine. LOL thanks Nick!

Its an iphone, wht do you expect.
galaxy s3 is way better

The only thing I could think of would be is to hold the home And lock button, keep holding it in until the apple screen comes on and it should work well again. (Soft reset)

Or by double tapping the home button and deleting all apps (it won't delete the hole thing just erases the data it uses to open back up quickly.)

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