IPHONE Help. My iphone keeps freezing and turning off?

Argh.So, I used to have an iphone 3gs on contract, and one day I dropped it on the carpet and it never switched back on again, and no place could fix it so I bought a second hand 3g to keep me going until my contract ended, the 3g I bought was 2 years old so it's slow, freezes sometimes, and the battery life isn't great but I've never had any serious problems with it…

Until now… The volume button must be stuck because the volume goes up on its own all the time, also the top lock button must be jammed because it used to lock on its own while I was in the middle of something, and it used to to come up where you had to slide to switch the phone off. So yeah I realised some of the buttons were broke/jammed, but if I gave it a little nudge on a hard surface (not very hard at all) it would stop doing it for a couple hours or so… But now it's randomly started switching off whilst I'm in the middle of doing something, but not just switching off a white screen comes up, and sometimes if has lines on it… I can't explain it but i'm sure you know your stuff about iphones you will know what I mean. Infact I'll upload a photo…

Here is the photo; image

Should I take it to the apple store, or to another phone place to get it fixed, do you think it even can be fixed? Or is it not worth paying when I could probably get another second hand one for around £80?

I just need something to tide me over until my contract ends in november… And the only phone I'm interested in having is an iphone so…

any tips and advice would be really appreciated so Please and Thank you!

The prob is on battery & screen
We can't change an iPhone battery like another phone
If the screen it maybe can be fixed
I don't think you should repair it. Not worth for me the cost for repare it must be more expensive than you buy another second hand phone

N if you really want to repare it than please only go for apple store not other!

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