How long will it take me to save up 800$?

I want the Iphone 5, My mom just got me the Samsung Galaxy Note 2 and i really am grateful but i want the Iphone 5 so i'm going to save up my money, I can't pawn my phone because it has a crack in the screen. I get paid 20 dollars a week and so i need to know how long it will take to save up 800 dollars, I will get extra each week if i work hard on chores which i will. I'm on Tmobile so the Iphone 5 will be on there april 12th and i thought someone said it was going to be 200 dollars but i guess it is going to cost 675 dollars and i'm saving extra for cases and to get out of my contract, Please Help!
Thank you!
By the way i'm 13 and please don't tell me i'm too young when i'm saving my own money!

Maybe several months to save.depending on how much you want to save as well. Stay with what you have and be happy. Maybe in a year there will be a much more nicer new phone out.

$20 a week is $100 in 5 weeks, $800 in 40 weeks, which is around the end of the year. At 13, you can't have a contract, your parents have a contract. Breaking a contract will cost your parents a few hundred dollars more.

This might be a great way for you to learn the value of phone & money, cheers.

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