Cracks on my iPhone disappeared then reappeared in a different place?

So I dropped my phone ages ago like in February and there's one long crack the centre of it and I dropped it again 2 weeks ago and there's a crack at the top (not on the screen) and a few days after I dropped it the second time these tiny cracks (that look like a tree with lots and lots of branches) appeared on my screen right above the first crack I made in February but that somehow disappeared and now today it's reappeared (I didn't drop my phone) but this time below the crack line and it's bigger, it's like tiny branches all connected to each other. It makes me feel funny seeing all these little lines connected but I'm also really freaked out, what's happening?

If your contract is up, then I would trade it in and upgrade, better to spend money on that rather then for fixing an older version, it might be like a free upgrade on new contract as iphones hold their value really well (even if broke they will give you something for it).
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Apple also recently boosted the trade-in values for the iPhone 4 and the iPhone 4S. Apple Stores now offer up to $99 toward a new device for an iPhone 4 and up to $199 for an iPhone 4S.

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