I keep dropping my iphone4. Will it last long?

I have had cases and screen protectors on it before but it started to ware of so i took it of. I dropped it many times and one was really bad were i was running in the 02 and it dropped out of my pocket and skidded on the floor. I have had it for 2 years and got it close to when the iphone4 came out.
Its got scraches on the screen and one is very deep and unattractive. The corner is very damaged (the time i was running) and chiped of and really rough. The back ha scraches also and smeary from grease. I'm on pay as you go not contract so i can't change the actuall phone.it still works absolutley fine but sometimes has problems charging and it really fast.

i was wondering how long left it has to live?
Also i was thinking if it was to completley damadge should i get a new phone and if yes, an iphone or a different smartphone?
Oh yeh and i have alot of apple products.got 3ipods including ipodtouch… Iphone4. Mac(not working). I was thinking of getting an ipad3 cause of the screen being big amd i will get the smallest GB as i only want it for browsing and movies… Should i buy it. Is it worth the money when i have an iphone already?
I an so sorry this is like the longest question in history… Really appreciate replied 5star answer rate thanks xxxx.

If the internal structure is okay and undamaged, it would be fine. Just cosmetic damages won't hurt. If you feel like its getting ugly, buy a case that hides it, or, buy a new iPhone casing from online or local shops and ask them to put on new casing on the iPhone. The casings now are not that expensive, unless you are using the iPhone 5.

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