I have memory problems on my iPhone

I'm using the iPhone 4 (8 GB). And now, my phone is showing 0 bytes of memory left. Small apps are using up a huge amount of memory.Eg: Facebook -146MB, Whatsapp- 129 MB, Subway surfers-72 MB, Temple run and twitter- 38 MB. What could possibly be wrong? And, my phone is not jailbreaked.

The same thing happened to my iPod touch (16GB) and I looked in >settings >general >about and I saw that all my memory was also being taken up by my apps, so I deleted the ones I didn't want and then I had more memory. If you don't want to do this I suggest you to buy an iPhone with more memory capacity. Hope this helps!

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