If I put my iPhone's SIM card into a different iPhone, will it work?

I have an iPhone 4 and the vibrate stopped working. My dad just bought an iPhone 4 and it has no SIM card yet or anything. It's just at the factory settings. Can I put my SIM card into that phone? Will I have all of the same contacts and things? Will it still work? Then can I give my dad my iPhone and he can buy a SIM card and set up his plan on that phone?

Yes it should do

Yes but It depends if te iphone is locked or unlocked. If it is locked you can take it to a shop.

If you have attached then yeah if you had something like T-Mobile you'll have to unlock it

Yes the SIM should work, assuming its either an official iPhone carrier SIM or unlocked. As far as the data you would of course have to transfer those between the iPhones.

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