How to save up for an iPhone5S? - 1

So, I'm 13 years old, and I don't NEED, but I want an iPhone5S. At the moment, I have a Blackberry 9320, and my parents don't mind me getting myself an iPhone, as long as I pay for it. I have two main ideas:
1) Save up around £300, and get a contract, and keep saving up money so I can pay for that contract.
OR,
2)Save up around £500, and just buy the phone, on Pay As You Go.

Either way, I need to get some cash! I'm quite a long way from my target, but like I said, I don't need the phone anytime soon! Its a treat.
I don't mind doing extra housework, because I'm really good at that, but I do that anyway for free, because of all the things my parents do for me.
I help my cousin with her homework, and I feel that its quite rude all of a sudden to ask for money, everytime I help her.
I can't walk dogs/babysit, because my parents wouldn't let me and I'm scared of dogs. My birthday passed 2 months ago, and its coming to Christmas in a week's time. I've asked for money, for Christmas, from my parents, and auntie's and uncles.
I have a lot of old toys, but I don't think I could sell them now, seeing as its Christmas and Winter.
I've heard that there are Carboot Sales, Maybe I could get my dad, to drive me to one, and I could get some old stuff sold? But Carboot Sales are really cheap… And I'd probably rather give my old stuff to Charity, as I always do… Please help, thanks in advance.

Why you need it? Is there any logical reason?

Don't get a contract phone. Then it'll trouble you for a very long time. Just save up.It'll plummet in price when a new model hits the streets in a few months.

You seem smart, why would you waste your money for months, just for empty prestige?
You are the future, don't buy into Apple's marketing scam.

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