Will my iPhone 4 sim work in an iPhone 4s?

I've just got an upgrade on my Vodaphone contract to an iPhone 4 but i'm thinking of selling it to get the 4s.

Will the sim card I have in this iPhone 4 work in the 4s with the use of all the functions available?

Yes! So long as the 4s isn't locked. Basically meaning so long as the new phone accepts Vodafone sims it will work no problem

Yes it will work. They both use the same type of sim card.

Just buy an iPhone 4s which is either unlocked or locked to Vodaphone or the sim card won't work.

I use a 4s now and it is much faster than the 4 and the camera is better, but if you can afford it get a 5 because that is the best upgrade. If you can't, the iPhone 4s is really good too.

The 4 & 4s both take the micro sim, as long as the phone you purchase is: either locked to your sims network (Vodafone) or unlocked to all networks, it will be fully functionally.

If you do buy the iPhone 5, it takes the: Nano sim, so you'll either have to order a new sim or get your current sim cut, most phone shops do it. I have the iPhone 5, it's not that much better than the 4s.

YES! Of course

Absolutely just make sure that the new phone you get is either on the same network as the current one or get a unlocked device and you will have absolutely no problems at all.

Yes as long as the 4S is unlocked or the same network.

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