How much will it cost to fix my iphone 4? - 1

I was out last week and it noticed that my phone had stayed on 33 percent charge for ages even though i was using it alot.
later on my phone turned off, and when i plugged it into charge would show apple symbol and then go blank and kept repeating this process.
i decided to restore my phone to factory settings to see if this would help
my phone would turn on (whilst on charge) but then turn off after a few minutes. Every time it would turn on, the percentage of battery would be significantly different. For example, once it was 100, then 1 then 7, then 14.
Now, my iphone won't turn on, and only shows the apple logo for 3 seconds when i plug onto charge an then goes blank.

if you can work out what is wrong how much would it cost to fix this issue ( in a market stall or small shop)

also, the lock button is broken how much would it cost to fix that too?

my phone is pay as you go and the warranty has ran out.

TIPS FOR GETTING BORED ON A PLANE JOURNEY?

So i'm going on holiday and i have my iphone so i can listen to music but what if i get bored of that?
I'm really bad at being still for a long period of time… Thanks in advance.

Starbucks on passbook? IPhone device?

Hi guys I recently downloaded the Starbucks app and got the Starbucks card on my passbook (which I can reload whenever I want) my question here is that my girlfriend of long term is also a big Starbucks fan. Would there be any way if she can use the same card as well? I saw on passbook that I can send it to her in a message and she can "add" it to her passbook. Would she be able to use it without any issue at the store since it's under my name? All answers will help thank you

Why can't I skip songs backwards in iPhone music app?

If I want to go back to the previous track in my music list, by simply hitting the back arrow while music is playing, music app will not skip the current song to play the one previous. It will restart the current song but will not skip it. IPhone 5s. Why?!