How to prank a Christmas present? - 1

Okay last year my family played a mean prank on me:/ lol it's quite embarrassing and got it on camera. This year I'm giving them 'gifts' that they don't like or is weird to be given as a present xD
I have toothpaste, an old pencil, some shoe box with wrapper inside(no shoes) and I want to prank my younger sis about giving her a iphone. She's a bit young and not mature about having one. But I can't wait to see her face and my older brother thought it would be a great idea!
She would probably just be like wtf. And laugh so it's not really a bad thing and She's always complaining and not grateful for what she has. So yeah. Please help? And to have a good laugh this year. It's so clever! Haha
Btw I'm 14 so no hard stuff to do.
Oh and where do I get an old phone box? I have an iPhone one but it has my name at the very top corner:/

LOL so give them wat they like.
in a box say you will be happy
than wait till they get excited.
than play never gonna give you up troll

Get a rock the same approximate size and weight(i owe this idea to "hotel for dogs")
well why not fake candy the ones that look like these.

hard to think of pranks that need no budget.
a jack in the box with an invisible ink squirter would be funny but then again no money… So we're back where we started. You could fill the 'gift' with naturally forming stink gas.

If I were you, I'd get her a fake iPhone. That would be even funnier.