Transferring number from old sim card to new?

Okay, say if you get a new phone (iPhone to iPhone 4) you take it to the store and get them to change your number from your old simcard to the new one that fits the new iPhone 4. Does the old phone not work anymore? And does all your contacts, photos etc stay on the old phone or go to the new phone with the new sim card?

The phone will still work it will just not have service on it. You can keep all your contacts, pictures apps others things by backing up your phone to itunes and restoring them to your new phone the sim card only gives you your wireless service

You should be able to save all you contacts to your sim, then put the sim in the new phone, then restore the contacts to your new phone.

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