Can you put the sim from a contract phone into a sim free phone?

Answer . \nYou should be able to if the phones are from the same network/phone company and based on the same technology. (Size for instance) Although you will need to add (MORE)
In iPhone

Can you buy an iPhone and just put the sim card from your existing ATT 3G phone in I did so in my brother's iPhone and got service and wanted to know if there was a way to do this with a new iphone?

An AT&T 3G sim card will work in a new iPhone. yessss you can :) but the box for the iPhone comes with a little tool to help you open the little compartment for the sim (MORE)

Does a vodafone sim card work in a web slider?

no, unless you unlock it by paying a rediculous price of $80. You are buying the phone and it should be your choice of what company you want to use!!!!! Phone companies these (MORE)