My iPhone 4 froze on Internet but I could still write?

I was on Wikipedia and i pressed the home button and lock button but it wouldn't work, I could write in the search box. I let the battery run out and then charged it and it's now working, but I'd just like to know what it was, or will it happen again?

It could've been a small freeze which happens every once in a while. Is you iPhone 4 jailbroken? Most of the time, iDevices freeze because of too many tweaks or storage used on Cydia, etc.
It's nothing big to be scared about. If it happens again, do what you did last time.

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