What else should I add to my reasoning?

So, me and my grandfather are gonna have a talk about him getting me a IPhone 5 or 5s for Christmas. And I've been thinking of things that could convince him.

Right now, I have an iPod Touch and I'm willing to sell it if I get it.

A Good reason is it can be handy.

I'm also about to be 15 years old.

But I really need some good reasons on why I should get it.

So he/your parents can contact you
So you can contact them if you need to
Because you will be responsible with it and take care of it since you know it is a very expensive purchase that is easily broken.

I would offer to work towards the cost of one.

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