Can i get a replacement sim card with my iphone contract but to go in a normal phone?

I currently have a iphone and my mum has a blackberry and her contract is due to renewal
so i'm going to get a new iphone and she wants to keep the blackberry
so i was thinking of telling my phone company i have lost my phone and get a replacement sim so she can have it in her blackberry because i can't just take the one out of my current iphone and put it in the blackberry its a different size
so we end up swapping contracts where i have a new iphone on her contract and she has the old blackberry on my old contract and a iphone to sell… Does this work?

and also does a iphone 5 sim work in a iphone 4?

thanks for your help if you managed to get your head round it!

Earbuds work only when halfway in?

So I got these skullcandy earbuds about a month ago and they worked perfectly fine until now… They work only when half way plugged in, I tried plugging them into my iPod iPhone laptop, all the same, I can't afford to get anymore, THEY COST 45.00$

IPhone 5 or Samsung Galaxy 3s?

I know this question has been asked a lot over the past few weeks, but I just can't decide and need opinions. I'm an iPhone user I have the 4s and I like it it's easy to use and I've become very familiar with it. My husband has the galaxy s3 and I have played with it quite a lot and I reall like it, I have had a little play around with the iPhone 5 and I'm nor really impressed in saying that I've only played around for about an hour so it's difficult to comment! What are your thoughts? What do you have and what would you recommend?

Will my verison iPhone 4 work in China?

I'm going to China for 10 days in November and I'm worried that my phone won't have service being I'm from The USA. I have Verison and its an iPhone 4. Will it possibly have Internet but not be able to text or make calls. I've heard that it will text but no calls and I've heard that nothing will work, not even Internet. So I'm just trying to get a real answer. Does anyone know from experience or work for verison or something?